1998 Mercury Mountaineer Differentials

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Keep Your 1998 Mercury Mountaineer in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1998 Mercury Mountaineer looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Bearings, Rear Housing Cover Gaskets, and Differential Oil. 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 Royal Purple. For example, Motive Gear Differentials start at just $2.99 with an average 4.1 star rating. National and Royal Purple offer similar pricing and quality, backed by strong customer feedback. With over 771 reviews and a solid 4.1 star average, you can shop with confidence knowing other Mercury Mountaineer owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1998 Mercury Mountaineer Differential at Advance Auto Parts is around $211.46, with a range that starts at $1.29 and goes up to $1,115.99. With 192 options in stock from 18 trusted brands, finding the right fit is easy. Popular picks like Driveworks Taper Bearing Set, S-A-5, Felpro Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket, RDS 55341, and Valvoline Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-140, 1 Quart, 889787 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 1998 Mercury Mountaineer in peak condition, inside and out.

Essential 1998 Mercury Mountaineer Differentials

Yukon Gear – "Yukon Gear Spider Gear Kit for Ford 8.8"", 31 Spline, Trac Loc Posi, 16106" (Part No.16106)

"Yukon Gear Spider Gear Kit for Ford 8.8"", 31 Spline, Trac Loc Posi, 16106"

from

$363.99
Yukon Gear & Axle spider gear kits feature higher quality materials and better manufacturing techniques than OEM to ensure a longer lasting spider gear set. Kit delivers everything needed for a complete and proper spider gear set replacement.
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Sealed Power – Sealed Power Engine Auxiliary Shaft Bearing Set, 1881M (Part No.1881M)

Sealed Power Engine Auxiliary Shaft Bearing Set, 1881M

from

$38.99
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.
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Yukon Gear – "Yukon Gear Super Carrier Shim Kit for Ford 8.8"", GM 12 bolt car & truck, 8.6 & Vette, 55002" (Part No.55002)

"Yukon Gear Super Carrier Shim Kit for Ford 8.8"", GM 12 bolt car & truck, 8.6 & Vette, 55002"

from

$59.99
Yukon shim kits are precision machined and tailored for each individual application to ensure you have the right shims for every set up.
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Yukon Gear – "Yukon Gear Trac Loc Positraction, Ford 8.8"", 31 Spline, With Carbon Fiber Clutches, 20130" (Part No.20130)

"Yukon Gear Trac Loc Positraction, Ford 8.8"", 31 Spline, With Carbon Fiber Clutches, 20130"

from

$774.99
“Yukon Trac Loc positraction, Ford 8.8″”, 31 spline, with Carbon Fiber clutches.”
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Motive Gear – Motive Gear Differential Ring and Pinion, F8.8-410 (Part No.F8.8-410)

Motive Gear Differential Ring and Pinion, F8.8-410

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$241.99
Motive Gear Differential Ring and Pinion, F8.8-410.
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Motive Gear – Motive Gear Differential Ring and Pinion, D35-373 (Part No.D35-373)

Motive Gear Differential Ring and Pinion, D35-373

from

$191.99
Motive Gear Differential Ring and Pinion, D35-373.
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Yukon Gear – "Yukon Gear Outer Oil Slinger For Ford 7.5"", 8.8"", 9"", 10.25"", 33022" (Part No.33022)

"Yukon Gear Outer Oil Slinger For Ford 7.5"", 8.8"", 9"", 10.25"", 33022"

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.”
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Powertrax – Powertrax Differential Lock Assembly, 1821-LR (Part No.1821-LR)

Powertrax Differential Lock Assembly, 1821-LR

from

$441.99
For vehicles that are driven daily, the Power Trax 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 Power Trax No-Slip locker easily installs in to your differential carrier using basic tools and without affecting your ring and pinion settings. Power Trax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Power Trax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds.
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Yukon Gear – "Yukon Gear Side Gear and Thrust Washer (0.750"" Shaft) for 8.8"" Ford, 33298" (Part No.33298)

"Yukon Gear Side Gear and Thrust Washer (0.750"" Shaft) for 8.8"" Ford, 33298"

from

$6.99
Yukon Gear & Axle manufactures a full line of top quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers and much, much more. For all your differential small parts needs, look no further than Yukon.
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Pro-King – Pro-King Differential Cover Gasket, 762B303 (Part No.762B303)

Pro-King Differential Cover Gasket, 762B303

from

$4.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Yukon Gear – "Yukon Gear Pinion Gear and Thrust Washer (0.750"" Shaft) for 8.8"" Ford, 33297" (Part No.33297)

"Yukon Gear Pinion Gear and Thrust Washer (0.750"" Shaft) for 8.8"" Ford, 33297"

from

$8.99
Yukon Gear & Axle manufactures a full line of top quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers and much, much more. For all your differential small parts needs, look no further than Yukon.
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Pro-King – Pro-King Differential Case (Empty), 762B714A (Part No.762B714A)

Pro-King Differential Case (Empty), 762B714A

from

$242.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Pro-King – Pro-King Differential Cross Shaft, 742G930 (Part No.742G930)

Pro-King Differential Cross Shaft, 742G930

from

$2.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Dorman – Dorman Differential Clutch Kit, 697-780 (Part No.697-780)

Dorman Differential Clutch Kit, 697-780

from

$262.99
This differential disc kit is a low-cost, time-saving repair solution for the posi-traction function. They are designed to match the fit and performance of the original disc on specific vehicle years, makes and models.
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Motive Gear – Motive Gear Differential Internal Carrier Gear Kit, F8.8BI (Part No.F8.8BI)

Motive Gear Differential Internal Carrier Gear Kit, F8.8BI

from

$96.99
Motive Gear Differential Internal Carrier Gear Kit, F8.8BI.
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Yukon Gear – Yukon Gear Crush Sleeve, 33093 (Part No.33093)

Yukon Gear Crush Sleeve, 33093

from

$10.99
Yukon Gear & Axle manufactures a full line of top quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers and much, much more. For all your differential small parts needs, look no further than Yukon.
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Yukon Gear – Yukon Gear Spring Kit for Dana 28, Model 35IFS, Dana 44IFS & Dana 50IFS with Grizzly, 33263 (Part No.33263)

Yukon Gear Spring Kit for Dana 28, Model 35IFS, Dana 44IFS & Dana 50IFS with Grizzly, 33263

from

$44.99
Yukon Gear & Axle manufactures a full line of top quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers and much, much more. For all your differential small parts needs, look no further than Yukon.
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National – National Drive Axle Shaft Seal, 710429 (Part No.710429)

National Drive Axle Shaft Seal, 710429

from

$22.29
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.
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Pro-King – Pro-King Differential Internal Nest Kit, 762B717A (Part No.762B717A)

Pro-King Differential Internal Nest Kit, 762B717A

from

$91.99
Pro-King is the leading supplier of transmission and driveline products in the aftermarket.
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Motive Gear – Motive Gear Differential Master Bearing Kit – Koyo, R8.8RMK (Part No.R8.8RMK)

Motive Gear Differential Master Bearing Kit - Koyo, R8.8RMK

from

$128.99
Motive Gear Differential Bearing Kits Include Front & Rear Pinion Bearing, Pinion Seal, Carrier Bearings, Pilot Bearing Where Applicable, Gear Marking Compound, Crush Sleeve, Pinion Nut, Brush, Thread Locking Compound And Cover Gasket Or Rtv
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Schaeffler – Schaeffler Shaft Seal, SS2865 (Part No.SS2865)

Schaeffler Shaft Seal, SS2865

from

$11.99
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.
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USA Standard Gear – USA Standard Gear Differential Cross Pin, 17016 (Part No.17016)

USA Standard Gear Differential Cross Pin, 17016

from

$49.99
“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 is used in 8.5″” differentials using a Yukon Dura Grip, Eaton posi, ValueTrac, True Trac, Pro-Series Auburn, Detroit Locker or standard carrier with large bearing journals. 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.”
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Yukon Gear – "Yukon Gear Posi 12-Shim Kit, GM 8.2""/Gm 8.5""/12T/12P/Ford 8.8""/Cast Iron Vette, 16042" (Part No.16042)

"Yukon Gear Posi 12-Shim Kit, GM 8.2""/Gm 8.5""/12T/12P/Ford 8.8""/Cast Iron Vette, 16042"

from

$41.99
Yukon Gear & Axle manufactures a full line of top-quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers, and other general maintenance items. You can count on Yukon to fulfill all your differential small parts needs.
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Powertrax – Powertrax Grip LS Traction System, LS108831 (Part No.LS108831)

Powertrax Grip LS Traction System, LS108831

from

$463.99
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!
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Motive Gear – Motive Gear Differential Pinion Nut, 379570S (Part No.379570S)

Motive Gear Differential Pinion Nut, 379570S

from

$6.99
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.
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Yukon Gear – "Yukon Gear Standard Open Spider Gear Kit for 8.8"" Ford (And Ifs) with 28 Spline Axles, 16019" (Part No.16019)

"Yukon Gear Standard Open Spider Gear Kit for 8.8"" Ford (And Ifs) with 28 Spline Axles, 16019"

from

$285.99
Yukon Gear & Axle spider gear kits feature higher quality materials and better manufacturing techniques than OEM to ensure a longer lasting spider gear set. Kit delivers everything needed for a complete and proper spider gear set replacement.
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USA Standard Gear – USA Standard Gear Differential Rebuild Kit, 37030 (Part No.37030)

USA Standard Gear Differential Rebuild Kit, 37030

from

$201.99
USA Standard Master Overhaul kits let you finish your install with confidence. This kit uses Koyo bearings and races. Included 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), threading locking compound, marking compound with brush and gasket.
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Yukon Gear – "Yukon Gear Cover Bolt For Ford 7.5"", 8.8"" & 9.75"", 33554" (Part No.33554)

"Yukon Gear Cover Bolt For Ford 7.5"", 8.8"" & 9.75"", 33554"

from

$6.99
“Yukon 1541H alloy replacement rear axle for Dana 60, 70, and 80, 35 spline. (40″” to 43.5″”) Full float axle (8×3.96″” ). Yukon 1541H alloy axles offer a strength increase over stock while retaining a low cost. Yukon 1541H alloy rear axles come with a one year warranty against manufacturing defects. This is a full-floating axle.”
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Most Popular Differential Bearing for 1998 Mercury Mountaineers

Enhance your 1998 Mercury Mountaineer with this popular Differential Bearing we have in stock, for $7.99.

Driveworks – Driveworks Tapered Roller Bearing, S-LM-603012 (Part No.S-LM-603012)

Driveworks Tapered Roller Bearing, S-LM-603012

from

$7.99
Driveworks Tapered Roller Bearing, S-LM-603012.
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Best-Selling 1998 Mercury Mountaineer Rear Housing Cover Gasket

Upgrade your Mountaineer with our best-selling Rear Housing Cover Gasket with a 4.5 Starts rating across 121 reviews.

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

Felpro Axle Housing Cover Gasket Rectangular Shaped, 10 Bolt Hole Gasket, RDS 55341

from

$16.99
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.
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Top-Quality Differential Oil for 1998 Mercury Mountaineers

Choose a high-quality OEM or aftermarket Differential Oil for Mercury Mountaineers and enjoy top-notch performance from $15.99.

Royal Purple – Royal Purple MaxGear SAE 75W90 High Performance Gear Oil w/Friction Modifier Additive, 1 QT, 01300 (Part No.01300)

Royal Purple MaxGear SAE 75W90 High Performance Gear Oil w/Friction Modifier Additive, 1 QT, 01300

from

$26.49
Max Gear is recommended for truck and automotive differentials, outboard motor lower units or in rear axles or manual transmissions requiring an API fluid. Max Gear is a high performance automotive gear oil designed to provide maximum protection to heavily loaded gears while increasing power throughput through the drive train. Max Gear virtually eliminates both gear and bearing wear-even under severe squeeze film conditions caused by extremely high loads, sudden shock loads or low RPMs. Slippery, synthetic molecules not only reduce wear and friction but significantly increase Max Gear’s cold weather fluidity and lubricity, making it the ideal choice for vehicles operating in cold climates. Gears run smoother, quieter, cooler and longer without overhauls. It is noncorrosive to both ferrous and nonferrous metals.
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Royal Purple – Royal Purple MaxGear SAE 75W140 High Performance Gear Oil w/Friction Modifier Additive, 1 QT, 01301 (Part No.01301)

Royal Purple MaxGear SAE 75W140 High Performance Gear Oil w/Friction Modifier Additive, 1 QT, 01301

from

$28.49
Max Gear is recommended for truck and automotive differentials, outboard motor lower units or in rear axles or manual transmissions requiring an API fluid. Max Gear is a high performance automotive gear oil designed to provide maximum protection to heavily loaded gears while increasing power throughput through the drive train. Max Gear virtually eliminates both gear and bearing wear-even under severe squeeze film conditions caused by extremely high loads, sudden shock loads or low RPMs. Slippery, synthetic molecules not only reduce wear and friction but significantly increase Max Gear’s cold weather fluidity and lubricity, making it the ideal choice for vehicles operating in cold climates. Gears run smoother, quieter, cooler and longer without overhauls. It is noncorrosive to both ferrous and nonferrous metals.
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Valvoline – Valvoline Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-140, 1 Quart, 889787 (Part No.889787)

Valvoline Flex Fill Transmission & Differential Gear Oil: Full Synthetic 75W-140, 1 Quart, 889787

from

$19.99
We’ve squeezed innovation into every ounce of Valvoline FlexFill SAE 75W-140 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-140 Full Synthetic Gear Oil is recommended for use in axle applications requiring factory-fill or drain-and-fill levels for limited slip performance. Volume: 1 quart.
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Yukon Gear – Yukon Gear 3 Qt – Penzoil 80W90 Conventional Gear Oil, 15002 (Part No.15002)

Yukon Gear 3 Qt - Penzoil 80W90 Conventional Gear Oil, 15002

from

$44.99
Union 76 gear oil is a conventional non-synthetic 80W90 formulation designed for all types of differentials.
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Yukon Gear – "Yukon Gear Redline Synthetic ""Shock Proof"" Oil – 4 Quarts, 15004" (Part No.15004)

"Yukon Gear Redline Synthetic ""Shock Proof"" Oil - 4 Quarts, 15004"

from

$137.99
Redline Heavy Shockproof Gear Oil is formulated to provide lasting protection.
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Valvoline – Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid 1 GA, 904891 (Part No.904891)

Valvoline Multi-Vehicle (ATF) Full Synthetic Automatic Transmission Fluid 1 GA, 904891

from

$35.99
Choosing an automatic transmission fluid just got easier. Valvoline Full Synthetic MaxLife Multi-Vehicle ATF, the #1 ATF product, is suitable for use in 95% of ATF vehicles in operation with US registered light duty applications. And now, it€™s also recommended for most belt and chain-driven continuously variable transmissions (CVT). Featuring advanced additives to prevent the major causes of transmission breakdown, it€™s designed to help prevent leaks, reduce wear and tear, and maximize performance €“ all for much longer than conventional fluids. It has improved thermal stability for longer fluid life, better viscosity stability for consistent transmission operation, and frictional enhancements for smooth gear engagements. Whether your vehicle has a CVT or traditional automatic, Valvoline MaxLife Multi-Vehicle ATF is suitable for a broad range of transmissions including Ford, GM, Toyota, Honda, Nissan, Hyundai, Subaru, BMW, Mercedes, Volvo, VW and Audi vehicles. It€™s specifically recommended for use in the following applications: GM DEXRON-II, DEXRON-III, DEXRON-VI, and DEX-CVT; Ford MERCON LV; Toyota/Lexus Type T, T-II, T-IV, WS, CVTF FE, and CVTF TC. For the many miles ahead, trust your transmission with Valvoline, the #1 automatic transmission fluid brand.
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Valvoline – Valvoline Extended Protection Full Synthetic Automatic Transmission Fluid ATF 1 QT, 904976 (Part No.904976)

Valvoline Extended Protection Full Synthetic Automatic Transmission Fluid ATF 1 QT, 904976

from

$15.99
Modern transmissions are better than ever, with more gears to help improve fuel efficiency and acceleration. Greater performance calls for greater protection. Valvoline Extended Protection Full Synthetic ATF features our exclusive Dual Defense Additive Technology for two layers of protection against metal-on-metal contact and thermal breakdown, all while minimizing wear on clutch components. In fact, Valvoline Extended Protection Full Synthetic ATF is 45% stronger against breakdown compared to major brand DEX/MERC oxidative PDSC performance. Proven to maximize transmission life, our patented formula keeps your modern vehicle shifting smoothly, mile after mile, with the ultimate protection you can only expect from Valvoline, the #1 ATF brand.
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Our Top Pick for a 1998 Mercury Mountaineer Differential Carrier Bearing Set

Invest in a durable Differential Carrier Bearing Set for your 1998 Mercury, knowing you’re getting trusted brands and expert craftsmanship.

Driveworks – Driveworks Taper Bearing Set, S-A-5 (Part No.S-A-5)

Driveworks Taper Bearing Set, S-A-5

from

$11.99
Value-priced bearing meets all cataloged application requirements.
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Top-Rated Differential Covers for 1998 Mercury Mountaineers

Make a smart move for your 1998 Mercury Mountaineer with products all priced from $8.99 to $399.99.

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

Dorman Differential Cover, 697-702

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.
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ATP – ATP Differential Cover Kit With Internal Magnet, 111103 (Part No.111103)

ATP Differential Cover Kit With Internal Magnet, 111103

from

$38.99
Differential covers can become damaged from road debris, corrosion, or bolt/drain plug over tightening. Their job is to act as a lid keeping lubricants in place for the ring and pinion gears, bearings, and bushings. Without lubricants, the differential quickly become damaged. ATP Differential Cover Kits include a replacement gasket and are designed to fit and function just like the original part ensuring long life and durability.
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Yukon Gear – "Yukon Gear Outer Oil Slinger For Ford 7.5"", 8.8"", 9"", 10.25"", 33022" (Part No.33022)

"Yukon Gear Outer Oil Slinger For Ford 7.5"", 8.8"", 9"", 10.25"", 33022"

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.”
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Yukon Gear – "Yukon Gear Steel Cover for Ford 8.8"", 32328" (Part No.32328)

"Yukon Gear Steel Cover for Ford 8.8"", 32328"

from

$99.99
These Yukon replacement diff covers are a direct bolt-on.
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Yukon Gear – "Yukon Gear Chrome Cover for 8.8"" Ford, 32009" (Part No.32009)

"Yukon Gear Chrome Cover for 8.8"" Ford, 32009"

from

$74.99
These Yukon replacement diff covers take your rig a step beyond the boring factory look. They are the stock OE design finished in chrome.
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B & M – B & M Black Cast Aluminum Differential Cover For Ford 8.8 In., 41297 (Part No.41297)

B & M Black Cast Aluminum Differential Cover For Ford 8.8 In., 41297

from

$399.99
Our engineers designed the line of Hi-Tek differential covers to not only look good but address a number of weaknesses of the factory stamped steel covers. First, they started by constructing the covers of thick A356.0-T6 aluminum, which dissipates heat much faster than the factory steel unit keeping the fluid temperature lower under high-stress loads vs. a steel cover. Then for added durability, we added a reinforced center bar for extra strength along with load bolts to help prevent bearing cap deflection under severe loads. The internal shape of the cover retains the smooth round back internally to help keep the fluid flow going over the ring gear to properly lubricate the gears and bearings. Additional features include a magnetic drain plug for catching ferrous metal particles, MIL-Spec black anodized finish, machined B&M logo, and all necessary hardware and easy to follow detailed instructions for a quick and simple installation you can do at home. Note: Does not include gasket.
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B & M – "B & M Cast Aluminum Differential Cover For Ford 8.8"", 40297" (Part No.40297)

"B & M Cast Aluminum Differential Cover For Ford 8.8"", 40297"

from

$311.99
Our engineers designed the line of Hi-Tek differential covers to not only look good but address a number of weaknesses of the factory stamped steel covers. First, they started by constructing the covers of thick A356.0-T6 aluminum, which dissipates heat much faster than the factory steel unit keeping the fluid temperature lower under high-stress loads vs. a steel cover. Then for added durability, we added a reinforced center bar for extra strength along with load bolts to help prevent bearing cap deflection under severe loads. The internal shape of the cover retains the smooth round back internally to help keep the fluid flow going over the ring gear to properly lubricate the gears and bearings. Additional features include a magnetic drain plug for catching ferrous metal particles, natural finish, machined B&M logo, and all necessary hardware and easy to follow detailed instructions for a quick and simple installation you can do at home. Note: Gasket not included.
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Top-Rated Differential Brands For Your 1998 Mercury Mountaineer

When it comes to finding the perfect Differential for your 1998 Mercury Mountaineer, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 18 trusted brands. We carry the most popular Differential brands including Royal Purple, 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 1998 Mercury Mountaineer, providing peace of mind with parts that meet or exceed OEM standards.

Popular Royal Purple 1998 Mercury Mountaineer Differentials

If you’re looking for a top-quality Differential for your 1998 Mercury Mountaineer, Advance Auto Parts has exactly what you need with our selection of Royal Purple Differentials. We have 2 Royal Purple Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $26.49 and an average cost of $27.49, you’ll find the perfect Differential for your needs and budget. Royal Purple Differentials for the 1998 Mercury Mountaineer come highly rated, with over 131 customer reviews and an impressive average rating of 4.8 stars. Choosing a Royal Purple Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.

Top-Quality National 1998 Mercury Mountaineer Differentials

For those in search of a high-quality Differential for their 1998 Mercury Mountaineer, 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 $11.99, with an average price of $68.76, giving you a range of options to suit your budget. Backed by over 18 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.
National Bearing Race, LM501314
from $11.99
(2)
National Bearing Race, LM501314
“good quality & price”
National Axle Differential Bearing & Seal Kit, RA-311
from $171.99
(4)
National Axle Differential Bearing & Seal Kit, RA-311
“Complete kit with for my rebuild. I was lucky to get awesome service from the salesman. Parts were very reasonable price-wise.”
National Drive Axle Shaft Seal, 710429
from $22.29
(12)
National Drive Axle Shaft Seal, 710429
“Exact fit”

FAQs for 1998 Mercury Mountaineer Differentials

What are the best-selling Differentials for 1998 Mercury Mountaineers?

Out of 192 Differentials that fit 1998 Mercury Mountaineers, the following parts are the top sellers:

What’s the price range for 1998 Mercury Mountaineer Differentials?

The prices of Differentials for the 1998 Mercury Mountaineer range from $1.29 up to $1,115.99 for the most premium parts.

What is the average price of a Differential for a 1998 Mercury Mountaineer?

The average price for Differentials for the 1998 Mercury Mountaineer is $211.46. 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 Mercury Mountaineer model years?

Yes, we carry Differentials for 12 model years of Mercury Mountaineers between 1997 and 2010. The following model years are the most popular for Differential purchases: 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, and 2002.

What are the cheapest Differentials for my 1998 Mercury Mountaineer?

The cheapest 1998 Mercury Mountaineer Differentials we carry are:

Does Advance Auto Parts sell Differentials for any other 1998 Mercury models?

Yes. We stock Differentials for 4 other popular 1998 Mercury models. Some of the most popular are 1998 Grand Marquis Differentials, 1998 Tracer Differentials, 1998 Mystique Differentials, 1998 Sable Differentials, and 1998 Villager Differentials.

What types of Differentials do you sell for my 1998 Mercury Mountaineer?

As of 8/2/26, these are some of the most in-demand types of Differentials for a 1998 Mercury Mountaineer:

Can I get help with 1998 Mercury Mountaineer Differential orders?

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

What is your return policy for Mercury Mountaineer Differentials?

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