1999 Ford Explorer Differentials

Keep Your 1999 Ford Explorer in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1999 Ford Explorer looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Rear Differential Cover Gaskets, Differential Oil, and Differential Pinion Seals. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Differentials from Trusted Brands

Looking for a reliable Differential? We’ve got you covered with options from brands you know and trust like Motive Gear, National, and Valvoline. For example, Motive Gear Differentials start at just $2.99 with an average 4.0 star rating. National and Valvoline offer similar pricing and quality, backed by strong customer feedback. With over 3,736 reviews and a solid 4 star average, you can shop with confidence knowing other Ford Explorer owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1999 Ford Explorer Differential at Advance Auto Parts is around $318.31, with a range that starts at $1.29 and goes up to $2,199.99. With 253 options in stock from 20 trusted brands, finding the right fit is easy. Popular picks like DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart, Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-90, 1 Quart, and Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket start at just $11.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Differential, don’t forget to check out other key components like 4WD Components and Universal Joints. At Advance Auto Parts, we’re here to help you keep your 1999 Ford Explorer in peak condition, inside and out.

Essential 1999 Ford Explorer Differentials

Yukon Gear – Dana 25, 27, 30, 44, Model 20 And Model 35, GM 7.5", 8.2", 8.5", 12P, 12T, C9.25 Rear Cover Bolt (Part No.33286)

Dana 25, 27, 30, 44, Model 20 And Model 35, GM 7.5", 8.2", 8.5", 12P, 12T, C9.25 Rear Cover Bolt

from

$9.99
5/16″-18 cover bolt, Dana Spicer 25, 27, 30 and 44, AMC Model 20 and Model 35, Chrysler 9.25 rear, GM 7.5″, 7.625″, 8.2″, 8.5″, 12 bolt passenger car and truck.

Product Features:
  • Cover bolt for Dana Spicer 25, 27, 30 and 44, AMC Model 20 and Model 35, GM 7.5″, 7.625″, 8.2″, 8.5″ and 12 bolt passenger car and truck.
  • 1/2″ head
See More

National – Multi-Purpose Bearing (Part No.A-5)

Multi-Purpose Bearing

from

$16.99
Product Features:
  • CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
  • PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
  • SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
  • OE-STYLE DESIGN: Engineered to meet OE specifications
  • COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
  • RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
See More

Yukon Gear – Mini Spool For Ford 8.8" With 31 Spline Axles (Part No.32226)

Mini Spool For Ford 8.8" With 31 Spline Axles

from

$194.99
Mini Spool for Ford 8.8″ with 31 spline axles and 7/8″ cross pin. Mini spools are a low-cost traction option for vehicles looking for full-time lockup. The mini spool installs into a standard open carrier and give 100% power to both tires at all times. These units are not recommended for street-driven vehicles. We recommend full spools for vehicles with large tires or high horsepower. These units come with a one year warranty against manufacturing defects.

Product Features:
  • Fits Ford 8.8″ with 31 spline axles
  • Provides 100% traction to both wheels at all times
  • Installs into standard open carrier case
See More

Powertrax – No-Slip Traction System (Part No.9204352706)

No-Slip Traction System

from

$519.99
For vehicles that are driven daily, the Powertrax No-Slip Traction System is the latest design in quiet traction-adding differential technology. It combines the automatic street-friendly smooth operation of a limited-slip differential with the traction performance of a locking differential. The Powertrax No-Slip locker easily installs in to your differential carrier using basic tools and without affecting your ring and pinion settings. Powertrax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Powertrax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds!The Powertrax® Lock-Right Locker provides outstanding traction for off-road machines and race vehicles. Powertrax No-Slip Traction Systems deliver excellent performance to street-driven cars and trucks.
  • Powertrax® lockers range from the original, Lock-Right for serious straight-line performance, to the No-Slip traction system for street-able vehicles.
  • Powertrax® offers three levels of GRIP locking differentials, ranging from the clutch-type GRIP LS with a forged steel case, the gear-driven GRIP PRO and finally the GRIP LOK for extreme traction.
  • Powertrax® = Extreme Traction Systems!
  • See More

    Spartan – Drive Axle Assembly; Ford EXPLR TRAC 01-02 Axle (Part No.RAXP1831H)

    Drive Axle Assembly; Ford EXPLR TRAC 01-02 Axle

    from

    $1606.99
    Remanufactured Rear Axle assemblies are completely disassembled, thoroughly cleaned and reassembled using new wear parts. Units are assembled, sealed & include backing plates, axle shafts & fluid.

    Product Features:
    • Rear axles are assembled with backing plates & axle shafts, and filled with fluid prior to shipping
    • Axles are fully painted & shipped securely in environmentally safe and recyclable containers that are the perfect size for returning your original core
    • Our complete Rear axle assemblies mean you just hang brakes, connect suspension & go! Your installation will be simple and trouble free
    • Remember to match axle ratio to original. For 4WD rear axle must match front axle ratio
    See More

    National – Shaft Repair Sleeve (Part No.99146)

    Shaft Repair Sleeve

    from

    $28.49
    National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.

    Product Features:
    • Designed to repair damaged, grooved or worn shafts
    • Durable stainless steel construction for corrosion-free sealing surface that surpasses most original shaft specifications
    • Ideal for a shaft where indications of seal wear, such as tracks or grooves have developed
    • Ultra-thin construction (0.01/0.25mm wall thickness) allows original seal size to be used with minimal additional lip loading
    • Easy to install with removable flange and installation tool
    See More

    Motive Gear – Differential Carrier Gear Kit (Part No.F8.8BI)

    Differential Carrier Gear Kit

    from

    $96.99


    Product Features:
    • FRD 8.8″ INT. KIT 31 SPL OPEN 1987 & LATER ONLY
    See More

    Yukon Gear – Carrier Installation Kit For Amc Model 35 Differential (Part No.57011)

    Carrier Installation Kit For Amc Model 35 Differential

    from

    $98.99
    Yukon Carrier installation kits are great, low cost kit for carrier changes such as Positraction or locker upgrades. Carrier installation kit for AMC Model 35 differential. This kit contains carrier bearings, races and shims.

    Product Features:
    • Fits AMC Model 35 with 27 spline axles
    • Includes carrier bearings and races and “super” carrier shim kit
    See More

    Yukon Gear – 8.8" Ford Tracloc Clutch Set, Both Sides (Part No.16018)

    8.8" Ford Tracloc Clutch Set, Both Sides

    from

    $241.99
    8.8″ Ford TracLoc (with short ears–for late models only) clutch set, both sides.

    Product Features:
    • Clutch kit
    • Fit Ford 8.8″ Trac Loc positraction
    See More

    Yukon Gear – Master Overhaul Kit Ford 8.8" IRS Differential, Suv’S With 3.250" OD Pinion Bearing Race (Part No.14155)

    Master Overhaul Kit Ford 8.8" IRS Differential, Suv'S With 3.250" OD Pinion Bearing Race

    from

    $419.99
    Yukon Master Overhaul kits give you all the high quality parts you need to start & finish every differential job. Yukon offers more tailor-made kits than any other manufacturer in the industry to meet your specific installation needs. This kit uses Timken bearings and races along with high quality seals and small parts. Included in this kit are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve (if applicable), oil baffles and slingers (if applicable), Thread locking compound, marking compound with brush, and gasket. Yukon’s Master Overhaul kits are the most comprehensive and complete kits on the market. They do extensive research to ensure that every kit is specially tailored to your application. Includes Supershims.

    Product Features:
    • Fits Ford 8.8″ IRS in SUV applications
    • Included are Timken bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve , thread locker, marking compound with brush, and gasket.
    See More

    Dorman – Ring and Pinion Bearing Installation Kit (Part No.697-104)

    Ring and Pinion Bearing Installation Kit

    from

    $179.99
    This differential bearing kit includes all necessary installation components for a differential ring and pinion on certain vehicle years, makes and models.

    Product Features:
    • Convenient kit – this ring and pinion bearing installation kit includes all necessary components for a complete repair on certain vehicle applications
    • Related repair – smart to have on hand when installing a differential ring and pinion
    • Durable construction – built for reliable longevity, free of defects in materials and workmanship
    • Trustworthy quality – backed by team of designers and engineers in the United States
    See More

    Motive Gear – Differential Ring and Pinion (Part No.F8.8-373A)

    Differential Ring and Pinion

    from

    $179.99


    Product Features:
    • FRD 10BL 8.8 R/P 3.73A MG
    See More

    Pro-King – Differential Internal Nest Kit (Part No.762B717A)

    Differential Internal Nest Kit

    from

    $99.99
    Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

    Product Features:
    • All products are designed to meet or exceed OE quality, form, fit and funtion.
    See More

    Yukon Gear – Trac Loc Positraction, Ford 8.8", 31 Spline (Part No.20069)

    Trac Loc Positraction, Ford 8.8", 31 Spline

    from

    $719.99
    Product Features:
    • Trac Loc positraction
    • Fits Ford 8.8″ with 31 spline axles
    See More

    Motive Gear – Differential Ring and Pinion (Part No.D35-355)

    Differential Ring and Pinion

    from

    $188.99


    Product Features:
    • DANA-35 R/P 3.55 RATIO
    See More

    Yukon Gear – Replacement Oil Baffle For Model 35 IFS Front, Dana 25, 27, 30, 44 IFS & Disconnect And Dana 50 (Part No.33002)

    Replacement Oil Baffle For Model 35 IFS Front, Dana 25, 27, 30, 44 IFS & Disconnect And Dana 50

    from

    $4.99
    Product Features:
    • Oil baffle for Dana Spicer 30, Dana Spicer 44 IFS, Dana Spicer 50, AMC Model 35 IFS
    See More

    Dorman – Help – Pinion Crush Sleeves (Part No.81056)

    Pinion Crush Sleeves

    from

    $6.49
    This differential crush sleeve is designed to match the fit and function of the original sleeve on specified vehicles, and is engineered for durability and reliable performance.

    Product Features:
    • Direct replacement – this differential crush sleeve is designed to match the fit and function of the original sleeve on specified vehicles
    • Required replacement – when servicing the differential
    • Durable construction – this part is made from quality materials to ensure reliable performance and long service life
    • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
    See More

    Motive Gear – Differential Gear Install Kit (Part No.F8.8IK)

    Differential Gear Install Kit

    from

    $35.99


    Product Features:
    • MINI INSTALL KIT FORD 8.8
    See More

    Yukon Gear – Pinion Install Kit For Model 35 IFS Differential For Explorer And Ranger (Part No.13084)

    Pinion Install Kit For Model 35 IFS Differential For Explorer And Ranger

    from

    $199.99
    Yukon Pinion installation kits are a terrific solution for gear installation on lower mileage vehicles where the carrier bearings & races can be reused. This kit uses Timken bearings and races along with a high quality pinion seal and small parts. Included in this kit are the pinion bearings and races, pilot bearing (if applicable), crush sleeve (if applicable), complete pinion shim kit, thread locker, and marking compound with brush. Yukon does extensive research for each application to make sure your kit will arrive with all the correct parts you need to install your pinion gear.

    Product Features:
    • Fits AMC Model 35 IFS
    • Included are pinion bearings and races, pinion seal, crush sleeve, complete pinion shim kit, and marking compound with brush.
    See More

    Yukon Gear – Super Carrier Shim Kit For Ford 8.8", GM 12 Bolt Car & Truck, 8.6 & Vette (Part No.55002)

    Super Carrier Shim Kit For Ford 8.8", GM 12 Bolt Car & Truck, 8.6 & Vette

    from

    $59.99
    Product Features:
    • Super carrier shim kit for Ford 8.8″, GM 12 bolt passenger car and truck, GM 8.0″, 8.6″, 8.6″ IRS and 1963-1979 Corvette
    • Interlocking design makes installation much easier
    See More

    Yukon Gear – Air Line Repair Kit, Zip Locker (Part No.34003)

    Air Line Repair Kit, Zip Locker

    from

    $52.99
    Air line repair kit, ZIP locker.

    Product Features:
    • Air line repair kit
    • Includes 20′ air line and two repair fittings
    See More

    Yukon Gear – Pinion Gear And Thrust Washer (0.875" Shaft) For 8.8" Ford (Part No.33299)

    Pinion Gear And Thrust Washer (0.875" Shaft) For 8.8" Ford

    from

    $11.99
    Pinion gear thrust washer (0.875″ shaft) for 8.8″ Ford.

    Product Features:
    • Pinion gear thrust washer for Ford 8.8″
    • 0.875″ diameter cross pin shaft applications only
    See More

    Yukon Gear – Pinion Seal For 7.5", 8.8", And 9.75" Ford, And Also 1985-’86 9" Ford (Part No.30037)

    Pinion Seal For 7.5", 8.8", And 9.75" Ford, And Also 1985-'86 9" Ford

    from

    $8.99
    Pinion seal for 7.5″, 8.8″, and 9.75″ Ford, and also 1985-’86 9″ Ford.Yukon Mighty seal.

    Product Features:
    • Pinion seal
    • Fits Ford 7.5″, 8.8″ and some 9.75″
    • 2.785″ O.D.
    See More

    Sealed Power – Engine Auxiliary Shaft Bearing Set (Part No.1881M)

    Engine Auxiliary Shaft Bearing Set

    from

    $36.99
    Sealed Power parts provide innovative designs, use leading-edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today’s modern engines.

    Product Features:
    • Steel-backed Babbitt lining material
    • Used in automotive and high-performance
    • Babbitt is designed to perform under extreme loads without damaging other engine parts
    • Babbitt is more environmentally friendly than other material
    • ISO & QS certified manufacturing
    See More

    Felpro – Axle Housing Cover Gasket Round Shaped 10 Bolt Hole Gasket (Part No.RDS 55460)

    Axle Housing Cover Gasket Round Shaped 10 Bolt Hole Gasket

    from

    $8.99
    Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

    Product Features:
    • Meets or exceeds all original equipment specifications
    • Application specific design to ensure a perfect fit
    • Engineered for the sealing repair environment
    • Validated for fit, form and function
    • Unsurpassed quality you can trust
    See More

    Yukon Gear – Outer Oil Slinger For Ford 7.5", 8.8", 9", 10.25" (Part No.33022)

    Outer Oil Slinger For Ford 7.5", 8.8", 9", 10.25"

    from

    $8.99
    Replacement outer oil slinger for Ford 7.5″, 8.8″, 9″, 10.25″, Nissan Titan rear, Dana 44 Rubicon & 44 JK non-Rubicon.

    Product Features:
    • Outer oil slinger for Ford 10.25″, 7.5″, 8.8″ and 9″ also Jeep JK and Nissan Titan rear
    See More

    Yukon Gear – Redline Synthetic "Shock Proof" Oil – 3 Quarts (Part No.15000)

    Redline Synthetic "Shock Proof" Oil - 3 Quarts

    from

    $99.99
    Redline Synthetic “Shock Proof” Oil. 3 Quarts.

    Product Features:
    • Includes three quarts of Redline Shockproof oil
    See More

    Yukon Gear – Redline Synthetic "Shock Proof" Oil – 4 Quarts (Part No.15004)

    Redline Synthetic "Shock Proof" Oil - 4 Quarts

    from

    $137.99
    Redline Synthetic “Shock Proof” Oil. 4 Quarts.

    Product Features:
    • Includes four quarts of Redline Shockproof oil
    See More

    Most Popular Rear Differential Cover Gaskets for 1999 Ford Explorers

    Enhance your 1999 Ford Explorer with one of the 4 Rear Differential Cover Gaskets we have in stock, starting at just $4.99.

    Felpro – Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket (Part No.RDS 55341)

    Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket

    from

    $15.99
    Fel-Pro gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

    Product Features:
    • Meets or exceeds all original equipment specifications
    • Application specific design to ensure a perfect fit
    • Engineered for the sealing repair environment
    • Validated for fit, form and function
    • Unsurpassed quality you can trust
    See More

    Mr. Gasket – Differential Gasket (Part No.142)

    Differential Gasket

    from

    $23.99
    Mr. Gasket Axle Housing/Differential Cover or Rear End Gaskets are manufactured from a .047 inch thick cellulose/nitrile composite gasket material for excellent sealing and durability. They are precision die-cut for an excellent fit.

    Product Features:
    • .047″ thick cellulose/nitrile composite gasket material
    • Precision die cut
    • Reusable
    See More

    Yukon Gear – 8.8" Ford Cover Gasket (Part No.23011)

    8.8" Ford Cover Gasket

    from

    $12.99
    8.8″ Ford cover gasket.

    Product Features:
    • Cover gasket
    • Fits Ford 8.8″
    See More

    Pro-King – Differential Cover Gasket (Part No.762B303)

    Differential Cover Gasket

    from

    $4.99
    Pro-King is the leading supplier of transmission and driveline products in the aftermarket.

    Product Features:
    • All products are designed to meet or exceed OE quality, form, fit and funtion.
    See More

    Best-Selling 1999 Ford Explorer Differential Oil

    Upgrade your Explorer with one of our 8 best-selling Differential Oil, earning an average 5 stars rating across 499 reviews.

    Royal Purple – High Performance 5W-30 Synthetic Engine Oil, Better Wear Protection, 5 Quart (Part No.51530)

    High Performance 5W-30 Synthetic Engine Oil, Better Wear Protection, 5 Quart

    from

    $41.99
    Royal Purple Motor Oil is a specially formulated multi viscocity oil for use in gasoline and diesel engines of all types from cars and trucks to SUVs, motorcycles and boats. Royal Purple(R) Motor Oil with Synerlec(R) additive technology reduces friction, which results in a 1-3 percent increase in horsepower, lowers operating temperatures, provides superior corrosion protection, improves fuel economy, reduces emissions and extends oil life. A.P.I. Certified.

    Product Features:
    • Better wear protection
    • Increased fuel efficiency
    • Better protection of the expensive catalytic emission system
    • Improved compatibility with fuels containing ethanol
    • Superior corrosion protection
    • Meets ILSAC GF-5 and Dexos1 performance requirements
    See More

    Valvoline – DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart (Part No.822405)

    DEXRON - VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart

    from

    $14.49
    Valvoline DEXRON-VI/MERCON LV ATF is a full-synthetic transmission fluid formulated with advanced additive technology to meet and exceed the requirements of the General Motors DEXRON-VI specification. It is officially licensed and approved by GM and is fully back-serviceable and can be used wherever DEXRON-II and/or DEXRON-III are recommended. Recommended for use in the following applications: DEXRON-VI, DEXRON-III, DEXRON-II, and Allison C-4.

    Product Features:
    • Formulated with full-synthetic base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
    • Enhanced anti-shudder protection for smooth shifting and maximum power transfer
    • Developed with anti-wear technology to help improve transmission durability
    • Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures
    See More

    Valvoline – SynPower Transmission & Differential Gear Oil: Full Synthetic 75W-140, 1 Gallon (Part No.887344)

    SynPower Transmission & Differential Gear Oil: Full Synthetic 75W-140, 1 Gallon

    from

    $69.99
    Valvoline SAE 75W-140 Full Synthetic Gear Oil provides the ultimate gear protection in hypoid rear differentials and non-synchronized manual transmissions. Engineered to outperform, our formulation provides exceptional high and low temperature protection and excellent thermal stability, especially in demanding driving situations such as towing and off-roading. It contains an extreme pressure additive for better load carrying capacity and wear resistance, a limited slip additive for optimal clutch pack performance, and an anti-foaming agent for better lubrication and service life. It’s recommended for conventional rear axles and transmissions requiring EP gear lubes under high speed, high load, high torque and high horsepower conditions.

    Product Features:
    • EXCEPTIONAL HIGH AND LOW TEMPERATURE PROTECTION ranging from -22F to 390F degrees
    • REDUCES CHATTERING AND PROTECTS GEAR TEETH from oxidation, rust, and wear
    • FIGHTS CORROSION AND RUST with emulsifying agents and safeguards against impurities, oxidation and thermal breakdown
    • MEETS THE DEMANDS OF CONVENTIONAL AND LIMITED SLIP REAR DIFFERENTIALS where API GL-5 is specified, as well as non-synchronized manual transmissions that require API GL-4
    • MEETS OR EXCEEDS PERFORMANCE REQUIREMENTS for Ford M2C-192A, GM 12346140, Chrysler MS-8985 and API GL-5
    See More

    Valvoline – DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart (Part No.798153)

    DEX/MERC ATF Conventional Automatic Transmission Fluid, 1 Quart

    from

    $11.99
    Valvoline DEX/MERC ATF is a high-quality transmission fluid formulated to meet the challenging demands of many automatic transmissions. Its responsive low-temperature fluidity is beneficial in both electronic and hydraulic controlled transmissions and transaxles. Recommended for use in the following applications: MERCON*, DEXRON*-III, Ford M2C138-CJ and M2C166-H, Allison C-4 and TES-389, and Caterpillar TO-2.

    Product Features:
    • Formulated with premium base stocks and advanced additive technology to meet the challenging demands of automatic transmissions
    • Enhanced anti-shudder protection for smooth shifting and maximum power transfer
    • Developed with anti-wear technology to help improve transmission durability
    • Engineered with a proprietary blend of base oils and advanced additives to provide better oil flow at low temperatures and greater film protection at higher temperatures
    See More

    Valvoline – Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-90, 1 Quart (Part No.889785)

    Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-90, 1 Quart

    from

    $18.99
    We’ve squeezed innovation into every ounce of Valvoline FlexFill SAE 75W-90 Full Synthetic Gear Oil, the ultimate gear protection in hypoid rear differentials and non-synchronized manual transmissions. Our unique new flexible pouch makes getting into the tightest places to lubricate gears easier than ever and with less waste. The superior detergent package-based formulation contains fully synthetic basestocks and special additives that help protect parts from rust and corrosion while providing exceptional high and low temperature protection and excellent thermal stability, especially in demanding driving situations such as towing and off-roading. It contains an extreme pressure additive for better load carrying capacity, wear resistance additives that assist in protecting gear teeth, a limited slip additive for optimal clutch pack performance, and an anti-foaming agent for better lubrication and service life. Valvoline FlexFill SAE 75W-90 Full Synthetic Gear Oil is recommended for use in axle applications requiring factory-fill or drain-and-fill levels for limited slip performance.

    Product Features:
    • FLEXIBLE POUCH FOR EASIER USE WITH LESS WASTE in tight, hard to reach undercarriage situations.
    • EXCEPTIONAL HIGH AND LOW TEMPERATURE PROTECTION ranging from -30F to 300F degrees for dependable coverage year-round
    • REDUCES CHATTERING AND PROTECTS GEAR TEETH from oxidation, rust, and wear
    • MEETS THE DEMANDS OF CONVENTIONAL AND LIMITED SLIP REAR DIFFERENTIALS where API GL-5 is specified, as well as non-synchronized manual transmissions that require API GL-4 or MT-1 fluid
    • MEETS OR EXCEEDS PERFORMANCE REQUIREMENTS for Mack GO-H and GO-J; API GL-5 and API MT-1; MIL-PRF-2105E; and SAE J2360
    See More

    Yukon Gear – Redline Synthetic "Shock Proof" Oil With Positraction Additive – 4 Quarts (Part No.15005)

    Redline Synthetic "Shock Proof" Oil With Positraction Additive - 4 Quarts

    from

    $148.99
    Redline Synthetic “Shock Proof” Oil with positraction Additive. 4 Quarts.

    Product Features:
    • Includes four quarts of Redline Shockproof oil and one 4oz bottle of Yukon positraction additive
    See More

    Yukon Gear – Redline Synthetic "Shock Proof" Oil – 3 Quarts (Part No.15000)

    Redline Synthetic "Shock Proof" Oil - 3 Quarts

    from

    $99.99
    Redline Synthetic “Shock Proof” Oil. 3 Quarts.

    Product Features:
    • Includes three quarts of Redline Shockproof oil
    See More

    Yukon Gear – Redline Synthetic "Shock Proof" Oil – 4 Quarts (Part No.15004)

    Redline Synthetic "Shock Proof" Oil - 4 Quarts

    from

    $137.99
    Redline Synthetic “Shock Proof” Oil. 4 Quarts.

    Product Features:
    • Includes four quarts of Redline Shockproof oil
    See More

    Top-Quality Differential Pinion Seals for 1999 Ford Explorers

    Choose a high-quality OEM or aftermarket Differential Pinion Seal for Ford Explorers and enjoy top-notch performance from $5.99.

    Driveworks – Oil Seal (Part No.S-3604)

    Oil Seal

    from

    $5.99
    Value-priced seal meets all cataloged application requirements.

    Product Features:
    • Brand may vary by location
    See More

    Driveworks – Oil Seal (Part No.S-714675)

    Oil Seal

    from

    $10.99
    Value-priced seal meets all cataloged application requirements.

    Product Features:
    • Brand may vary by location
    See More

    Motive Gear – Differential Pinion Seal (Part No.470331N)

    Differential Pinion Seal

    from

    $17.49
    All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of our products undergo rigid quality control processes to insure proper fit, performance and longevity. Motive Gear products can be found in the winners circle at NHRA, IHRA, NMRA, NMCA, SODA, SCORE, BITD, Ultra-4 and NASCAR events because we offer unmatched selection and quality demanded by racers and their crew chiefs – the same quality and selection demanded by DIY customers and top mechanics. With four warehouses strategically located across North America, most Motive Gear orders arrive within 2-4 days. Win with Motive Gear!
    See More

    FAG US – Shaft Seal (Part No.SS2876)

    Shaft Seal

    from

    $23.79
    Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Shaft Seal (Part No.SS2852)

    Shaft Seal

    from

    $20.99
    Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Shaft Seal (Part No.SS2865)

    Shaft Seal

    from

    $15.99
    Our wheel seals are engineered using only the highest-quality materials to meet vehicle manufacturer specificatons. We work with suppliers to design seals that meet FAG’s quality standards. Seals are designed to protect wheel end components from contamination – such as dirt, dust, and moisture – and prevent the loss of grease over the life of the bearing. The specifications for wheel seals are very demanding, and the type required depends on the specific application, position and vehicle class.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    Yukon Gear – Pinion Seal For 7.5", 8.8", And 9.75" Ford, And Also 1985-’86 9" Ford (Part No.30037)

    Pinion Seal For 7.5", 8.8", And 9.75" Ford, And Also 1985-'86 9" Ford

    from

    $8.99
    Pinion seal for 7.5″, 8.8″, and 9.75″ Ford, and also 1985-’86 9″ Ford.Yukon Mighty seal.

    Product Features:
    • Pinion seal
    • Fits Ford 7.5″, 8.8″ and some 9.75″
    • 2.785″ O.D.
    See More

    Top Picks for 1999 Ford Explorer Differential Covers

    Invest in one of our 6 durable Differential Covers for your 1999 Ford, knowing you’re getting trusted brands and expert craftsmanship.

    Dorman – Differential Cover (Part No.697-702)

    Differential Cover

    from

    $41.99
    This direct replacement differential cover matches the fit and function of the original equipment diff cover for a reliable, leak-free repair. It features a durable design, made to strict specifications, to help ensure reliable service life.

    Product Features:
    • Direct replacement – this differential cover matches the fit and function of the original equipment diff cover on select vehicles
    • Reliable repair – the smart solution for fixing an existing cover that’s rusted, damaged or leaking differential fluid
    • Durable construction – this differential cover is made according to strict engineering standards to help ensure dependability
    • Trustworthy quality – backed by a team of product experts in the United States and more than a century of automotive experience
    See More

    ATP – DIFF COVER KIT (Part No.111103)

    DIFF COVER KIT

    from

    $37.99
    DIFF COVER KIT

    Yukon Gear – Steel Cover For Ford 8.8" (Part No.32328)

    Steel Cover For Ford 8.8"

    from

    $99.99
    Yukon outer stub axle for Chrysler 9.25″ front. This axle uses a 1485 u/joint and has 33 splines.

    Product Features:
    • Fits Ford 8.8″
    • Steel
    See More

    Yukon Gear – Chrome Cover For 8.8" Ford (Part No.32009)

    Chrome Cover For 8.8" Ford

    from

    $74.99
    Chrome cover for 8.8″ Ford.

    Product Features:
    • Fits Ford 8.8″
    • Chrome
    See More

    Yukon Gear – 8.8" Ford Low Profile Ta HD Aluminum Rear Cover (Part No.32114)

    8.8" Ford Low Profile Ta HD Aluminum Rear Cover

    from

    $419.99
    8.8″ Ford low profile TA HD Aluminum rear Cover. This cover will not fit vehicles with independent rear suspension.

    Product Features:
    • Fits Ford 8.8″
    • Aluminum girdle cover
    See More

    B & M – Rear End Cover 1 EA B&M (Part No.40297)

    Rear End Cover 1 EA B&M

    from

    $269.99
    B&M Cast Aluminum Differential Covers are designed to strengthen the differential by preventing case distortion and ring gear & bearing cap deflection. Constructed of A356.0-T6 aluminum, these rugged covers significantly increase the fluid capacity and dissipate heat much faster than the stock factory unit to prolong the life of your ring and pinion gears. Additional features include an engraved B&M logo, drain and fill port locations, a magnetic drain plug for catching ferrous metal particles, and complete hardware and installation instructions.

    Product Features:
    • Additional Oil Capacity
    • More Cooling Ability
    • No Dipstick Modification
    • Some Include Fluid Pickup Extension
    • Built-In Drain Plugs
    • Cast Aluminum
    See More

    Top-Rated Differential Bearings for 1999 Ford Explorers

    Make a smart move for your 1999 Ford Explorer with products all priced from $6.99 to $59.99.

    National – Bearing Race (Part No.LM501314)

    Bearing Race

    from

    $9.29
    Manufactured with premium-grade steel, National taper bearing cups feature crowned raceways to ensure even load distribution.

    Product Features:
    • PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
    • SMOOTH ROTATION – Crowned raceways for even load distribution
    • OE-STYLE DESIGN – Engineered to meet OE specifications
    • COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
    • RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
    See More

    National – Multi-Purpose Bearing (Part No.A-36)

    Multi-Purpose Bearing

    from

    $27.99
    Product Features:
    • CONSISTENT PERFORMANCE: Matched cup and cone components ensure consistent performance
    • PREMIUM MATERIALS: Precision manufactured using premium-grade steel for outstanding durability and performance
    • SMOOTH ROTATION: Crowned raceways and rollers for even load distribution
    • OE-STYLE DESIGN: Engineered to meet OE specifications
    • COMPREHENSIVE COVERAGE: Industry-leading coverage for domestic and import applications
    • RIGOROUS TESTING: Comprehensive testing throughout design and development processes by National engineers for quality you can count on
    See More

    National – Tapered Roller Bearing Cone (Part No.LM501349)

    Tapered Roller Bearing Cone

    from

    $19.99
    Manufactured with premium-grade steel, National taper bearing cones feature crowned raceways and rollers to ensure even load distribution.

    Product Features:
    • PREMIUM MATERIALS – Precision manufactured using premium-grade steel for outstanding durability and performance
    • SMOOTH ROTATION – Crowned raceways and rollers for even load distribution
    • OE-STYLE DESIGN – Engineered to meet OE specifications
    • COMPREHENSIVE COVERAGE – Industry-leading coverage for domestic and import applications
    • RIGOROUS TESTING – Comprehensive testing throughout design and development processes by National engineers for quality you can count on
    See More

    FAG US – Cone (Part No.KNP343847)

    Cone

    from

    $59.99
    With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Bearing – DGBB (Deep Groove Ball Bearing) (Part No.6208-C3)

    Bearing - DGBB (Deep Groove Ball Bearing)

    from

    $24.79
    We develop and produce high-quality roller bearings, spherical bearings, and plain bearings worldwide for a wide range of applications.

    Product Features:
    • Radial Ball Bearing, Both Sides Shield.
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Cone (Part No.KM86649)

    Cone

    from

    $24.29
    With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Bearing – TRB (Tapered Roller Bearing) (Part No.KT5)

    Bearing - TRB (Tapered Roller Bearing)

    from

    $21.29
    With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    FAG US – Cup (Part No.LM501310)

    Cup

    from

    $9.99
    With advanced load-carrying capacity and compact design, tapered roller bearings are used in wheel bearings, transmissions, differentials, transfer cases and other miscellanous applications. FAG manufacturers over 100 million tapered roller bearings annually.

    Product Features:
    • High-precision and High-quality components used in all KITs
    • Coverage of classic and new high-tech solutions for the best system coverage
    See More

    Yukon Gear – Cross Pin Bolt (Part No.33067)

    Cross Pin Bolt

    from

    $6.99
    Cross pin bolt for Chrysler 8.25″, 9.25″ rear, Ford 7.5″, 8.8″, GM 12 bolt car & truck, 7.2″ IFs, 7.5″, 7.6″, 8.0″, 8.25″ IFS & 8.5″.

    Product Features:
    • Cross pin bolt for Chrysler 8.25″ and 9.25″ rear, Ford 7.5″ and 8.8″, GM 12 botl car and truck, 8.5″, 8.25″ IFS, 8.0″, 7.625″, 7.5″ and 7.2″ IFS
    See More

    Top-Rated Differential Brands For Your 1999 Ford Explorer

    When it comes to finding the perfect Differential for your 1999 Ford Explorer, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 20 trusted brands. We carry the most popular Differential brands including Valvoline, National, and Motive Gear, and more, all known for their exceptional customer ratings (average brand rating of 4.8 stars) and competitive prices, as low as $2.99. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1999 Ford Explorer, providing peace of mind with parts that meet or exceed OEM standards.

    Popular Valvoline 1999 Ford Explorer Differentials

    If you’re looking for a top-quality Differential for your 1999 Ford Explorer, Advance Auto Parts has exactly what you need with our selection of Valvoline Differentials. We have 2 Valvoline Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $14.49 and an average cost of $42.24, you’ll find the perfect Differential for your needs and budget. Valvoline Differentials for the 1999 Ford Explorer come highly rated, with over 366 customer reviews and an impressive average rating of 4.8 stars. Choosing a Valvoline Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
    DEXRON - VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart
    from $14.49
    (2)
    DEXRON – VI ATF Full Synthetic Automatic Transmission Fluid, 1 Quart
    “I’ve used this in my 2005 2500HD since I bought the truck with 20k on it now at 280k changed every other year maybe 40k I’d put on in two years, I pu”

    Top-Quality National 1999 Ford Explorer Differentials

    For those in search of a high-quality Differential for their 1999 Ford Explorer, Advance Auto Parts offers a great selection of National Differentials. With 3 National Differentials in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Differentials start at just $7.99, with an average price of $11.42, giving you a range of options to suit your budget. Backed by over 45 customer ratings and an average rating of 4.3 stars, National Differentials provide both reliability and excellent performance. Choosing a National Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
    Bearing Race
    from $9.29
    (2)
    Bearing Race
    “Reasonable price and woks well. front diff 2006 Escalade esv”
    Bearing Race
    from $7.99
    (4)
    Bearing Race
    “Goes with M88010 bearing cup. Application was the pinion bearing race for a Ford 9 Inch on a 1957 Ford F-100.”
    Multi-Purpose Bearing
    from $16.99
    (39)
    Multi-Purpose Bearing
    “Great bearings”

    FAQs for 1999 Ford Explorer Differentials

    What are the best-selling Differentials for 1999 Ford Explorers?

    Out of 253 Differentials that fit 1999 Ford Explorers, the following parts are the top sellers:

    What’s the price range for 1999 Ford Explorer Differentials?

    The prices of Differentials for the 1999 Ford Explorer range from $1.29 up to $2,199.99 for the most premium parts.

    What is the average price of a Differential for a 1999 Ford Explorer?

    The average price for Differentials for the 1999 Ford Explorer is $318.31. Keep in mind the variety of part types within our Differential category, where you are likely to find a wide range of prices across a variety of parts and components.

    Does Advance Auto Parts sell Differentials for other Ford Explorer model years?

    Yes, we carry Differentials for 33 model years of Ford Explorers between 1991 and 2025. The following model years are the most popular for Differential purchases: 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, and 2015.

    What are the cheapest Differentials for my 1999 Ford Explorer?

    The cheapest 1999 Ford Explorer Differentials we carry are:

    Does Advance Auto Parts sell Differentials for any other 1999 Ford models?

    Yes. We stock Differentials for 21 other popular 1999 Ford models. Some of the most popular are 1999 F-150 Differentials, 1999 F-250 Differentials, 1999 Mustang Differentials, 1999 E-250 Econoline Differentials, and 1999 E-350 Econoline Differentials.

    What are the top-rated Differentials that fit the 1999 Ford Explorer?

    The one 1999 Ford Explorer Differential we have in stock is the Differential Ring Gear Bolt. It costs $1.29.

    What types of Differentials do you sell for my 1999 Ford Explorer?

    As of 11/2/25, these are some of the most in-demand types of Differentials for a 1999 Ford Explorer:

    Can I get help with 1999 Ford Explorer Differential orders?

    Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Ford Differentials and more.

    What is your return policy for Ford Explorer Differentials?

    Advance Auto Parts keeps returns simple. For new Ford Explorer Differentials and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.