1978 GMC K35 Differentials

Keep Your 1978 GMC K35 in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1978 GMC K35 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Bearings, Differential Oil, and Rear Differential Cover Gaskets. 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 National, FELPRO, and Richmond Gear. For example, National Differentials start at just $10.99 with an average 4.3 star rating. FELPRO and Richmond Gear offer similar pricing and quality, backed by strong customer feedback. With over 96 reviews and a solid 5 star average, you can shop with confidence knowing other GMC K35 owners approve.

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 1978 GMC K35 in peak condition, inside and out.

Essential 1978 GMC K35 Differentials

Yukon Gear – Zip Locker Soleniod Valve (Part No.34014)

Zip Locker Soleniod Valve

from

$99.99
Zip Locker soleniod valve.

Product Features:
  • Solenoid valve
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Yukon Gear – Steel Cover For Dana 60 Standard Rotation (Part No.32321)

Steel Cover For Dana 60 Standard Rotation

from

$114.99
Product Features:
  • Fits standard rotation Dana Spicer 60
  • Steel
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Powertrax – No-Slip Traction System (Part No.9207053000)

No-Slip Traction System

from

$591.99
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

    Yukon Gear – Chrysler 9.25" And Dana 44 / 60 Tracloc Clutch Guide Replacement (Part No.33249)

    Chrysler 9.25" And Dana 44 / 60 Tracloc Clutch Guide Replacement

    from

    $8.99
    Product Features:
    • Clutch guide for Chrysler 9.25″, Dana Spicer 44 and Dana Spicer 60
    • For Trac Loc positraction applications only
    See More

    Yukon Gear – Dura Grip Positraction For 10.5" GM 14 Bolt Truck, 4.10 & Down (Part No.26030)

    Dura Grip Positraction For 10.5" GM 14 Bolt Truck, 4.10 & Down

    from

    $1110.00
    The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction. The Yukon Dura Grip uses a nodular case and forged 4320 internals for added strength along with composite clutches for high performance and long life. All units are Rebuildable and many offer upgrades to increase aggressiveness for racing applications. Each unit carries a one year warranty against defects.

    Product Features:
    • Fits GM 10.5″ 14 bolt truck
    • 4.10 ratio and down only
    • Clutch style positraction
    • Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
    • Fully rebuildable
    • Assembled in the USA
    See More

    USA Standard Gear – Replacement Spider Gear Set For Dana 60, 35 Spline (Part No.39009)

    Replacement Spider Gear Set For Dana 60, 35 Spline

    from

    $198.99
    Product Features:
    • Spider gear kit
    • Fits Dana Spicer 60, 35 spline open differential
    • Includes two side gears, two pinion gears, cross pin shaft, roll pin and spider gear thrust washers.
    See More

    Motive Gear – Differential Carrier Bearing Kit – Timken (Part No.R10.5CKT)

    Differential Carrier Bearing Kit - Timken

    from

    $93.99
    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

    Product Features:
    • CARRIER BEARING KIT FRD 10.5″ W/TIM
    See More

    Motive Gear – Differential Bearing Kit – Timken (Part No.R14RT)

    Differential Bearing Kit - Timken

    from

    $145.99
    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

    Product Features:
    • KIT BRG & SEAL GM 14 BLT 10.5″
    See More

    Pro-King – Differential Internal Nest Kit (Part No.744A717)

    Differential Internal Nest Kit

    from

    $323.99
    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 – Pilot Bearing For 10.5" 14 Bolt Truck, 2.050" O.D. (Part No.18041)

    Pilot Bearing For 10.5" 14 Bolt Truck, 2.050" O.D.

    from

    $57.99
    Pilot bearing for 10.5″ 14 bolt truck, 2.050″ O.D.

    Product Features:
    • Pilot bearing
    • Fits GM 10.5″ 14 bolt truck
    • 2.050″ O.D.
    See More

    Motive Gear – Differential Ring and Pinion (Part No.D70-410)

    Differential Ring and Pinion

    from

    $245.99


    Product Features:
    • DANA-70 R/P 4.10 STD MG 72154-5X .625″ OFFSET
    See More

    Yukon Gear – Dana 60 & Dana 70 Power Lok Clutch Set (Steel & Fiber) (Part No.16155)

    Dana 60 & Dana 70 Power Lok Clutch Set (Steel & Fiber)

    from

    $181.99
    Dana 60 & Dana 70 Power Lok clutch set (steel & fiber).

    Product Features:
    • Clutch kit
    • Fit Dana Spicer 60, 70, 70U and 70HD Powr Lok positraction
    See More

    Yukon Gear – Dana 50 Dana 60 Dana 70 & Dana 80 Roll Pin, 0.225" Dia, For X/P Shaft, 1.87" Lng (Part No.33327)

    Dana 50 Dana 60 Dana 70 & Dana 80 Roll Pin, 0.225" Dia, For X/P Shaft, 1.87" Lng

    from

    $7.99
    Dana 50 Dana 60 Dana 70 & Dana 80 roll PIN, 0.225″ DIA, for X/P shaft, 1.87″ LNG.

    Product Features:
    • Roll pin for Dana Spicer 50, 60, 70, 70U, 70HD and 80
    • 0.225″ diameter
    • 1.870″ long
    See More

    Yukon Gear – Bearing Race Driver (Part No.56013)

    Bearing Race Driver

    from

    $215.99
    Bearing race driver. No return.

    Product Features:
    • Bearing race driver
    • Fits HM807010 race
    • All steel construction
    See More

    Yukon Gear – Dana 44 JK / 60 / 70U Pinion Nut Washer Replacement (Part No.33164)

    Dana 44 JK / 60 / 70U Pinion Nut Washer Replacement

    from

    $3.99
    Product Features:
    • Pinion nut washer for Chrysler 7.25″, 8.25″, 8.75″ with 29 spline pinion, Jeep JK rear, Dana Spicer 60, 70, 70U and 70HD and 2007-2010 Ford 10.5″
    See More

    Yukon Gear – Steel Spool For Dana 60 With 35 Spline Axles, 4.56 & Up (Part No.32043)

    Steel Spool For Dana 60 With 35 Spline Axles, 4.56 & Up

    from

    $414.99
    Yukon Performance spool for Dana 60 with 35 spline axles. fits 4.56 and up. Yukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Spools provide 100% power to both tires at all times and are a lower cost alternative to lockers. Spools are not recommended for street driven vehicles. Yukon Performance spools come with a one year warranty against manufacturing defects.

    Product Features:
    • Fits Chrysler Dana Spicer 60 with 35 spline axles
    • 4.56 and up ratio only
    • Provides 100% traction to both wheels at all times
    • Not recommended for street driven vehicles
    See More

    Yukon Gear – Replacement Outer Oil Slinger For Dana 60, 70, 70U & 70HD (Part No.33019)

    Replacement Outer Oil Slinger For Dana 60, 70, 70U & 70HD

    from

    $5.99
    Product Features:
    • Outer oil slinger for Dana Spicer 60, 70, 70U and 70HD
    See More

    Yukon Gear – Dana 60 & Dana 70 Power Lok Case Bolt (Part No.33236)

    Dana 60 & Dana 70 Power Lok Case Bolt

    from

    $7.99
    Dana 60 & Dana 70 Power Lok case bolt.

    Product Features:
    • Power Lok case bolt for Dana Spicer 60 and 70
    • 7/16 x 14 thread
    • 3.5″ long
    • 9/16″ hex head
    See More

    Yukon Gear – Dana 60, Dana 70 & Dana 80 Cover Bolt (Part No.33235)

    Dana 60, Dana 70 & Dana 80 Cover Bolt

    from

    $5.99
    3/8″ cover bolt, Dana 60, Dana 70 & Dana 80.

    Product Features:
    • Cover bolt for Dana Spicer 60, 70 and 80
    • 3/8″
    See More

    Yukon Gear – Seal Housing For Dana 60, Zip Locker, With O-Rings (Part No.34039)

    Seal Housing For Dana 60, Zip Locker, With O-Rings

    from

    $79.99
    Seal housing for Dana 60, Zip locker, with o-rings.

    Product Features:
    • Seal housing for Dana Spicer 60
    • Includes o-rings
    See More

    Yukon Gear – Differential (Part No.26037)

    Differential

    from

    $854.99
    Differential

    Yukon Gear – Side Gear Thrust Washer For Dana 60, 70 & 80 (Part No.33532)

    Side Gear Thrust Washer For Dana 60, 70 & 80

    from

    $4.99
    Product Features:
    • Side gear thrust washer for Dana Spicer 60, 70, 70U, 70HD and 80
    • Fits standard open differentials only
    See More

    Yukon Gear – Replacement Carrier Shim Kit For Dana 70 & 70HD (Part No.55019)

    Replacement Carrier Shim Kit For Dana 70 & 70HD

    from

    $126.99
    Product Features:
    • Carrier shim kit
    • Fits Dana Spicer 70 and 70HD
    See More

    Victor Reinz – Differential Cover Gasket (Part No.71-14868-00)

    Differential Cover Gasket

    from

    $9.99
    With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

    Product Features:
    • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
    See More

    Yukon Gear – The Carrier Bearing Puller (Part No.56072)

    The Carrier Bearing Puller

    from

    $883.99
    The Yukon carrier bearing Puller works with an impact gun to quickly and safely remove carrier bearings without damaging them. This unit comes with a handy bench top stand and works with up to one ton applications including Dana 70HD, Dana 80, 10.25″ & 10.5″ Ford, or GM & Chrysler 11.5″ differentials.

    Product Features:
    • Carrier bearing puller
    • Works with an impact gun to safely and easliy remove carrrier bearings
    See More

    Yukon Gear – Standard Open Spider Gear Replacement Kit For Dana 60 And 61 With 35 Spline Axles (Part No.16085)

    Standard Open Spider Gear Replacement Kit For Dana 60 And 61 With 35 Spline Axles

    from

    $301.99
    Yukon standard open spider gear replacement kit for Dana 60 and 61 with 35 spline axles. Yukon uses higher quality materials and better techniques than OEM to ensure a longer lasting spider gear set. All components come with a one year warranty against manufacturing defects.

    Product Features:
    • Spider gear kit
    • Fit Dana Spicer 60 open differential with 35 spline axles
    • Includes two side gears, two pinion gears, cross pin shaft, roll pin and spider gear thrust washers.
    See More

    National – Bearing Race (Part No.HM803110)

    Bearing Race

    from

    $20.49
    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

    Yukon Gear – 10.5" GM 14 Bolt Truck Pinion Nut (Part No.33148)

    10.5" GM 14 Bolt Truck Pinion Nut

    from

    $48.99
    10.5″ GM 14 bolt truck pinion nut. 1 1/2″ socket, 15/16″ x 16 thread.

    Product Features:
    • Pinion nut for GM 10.5″ 14 bolt truck
    • 15/16″ x 16 thread
    • 1.5″ socket
    See More

    Popular 1978 GMC K35 Differentials Categories

    Most Popular Differential Bearings for 1978 GMC K35s

    Enhance your 1978 GMC K35 with one of the 4 Differential Bearings we have in stock, starting at just $10.99.

    National – Bearing Race (Part No.382A)

    Bearing Race

    from

    $10.99
    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

    Driveworks – Tapered Cone Wheel Bearing Assembly (Part No.S-387-AS)

    Tapered Cone Wheel Bearing Assembly

    from

    $18.49
    Value-priced bearing meets all cataloged application requirements.

    Product Features:
    • Brand may vary by location
    See More

    National – Bearing Race (Part No.453X)

    Bearing Race

    from

    $23.99
    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 – Bearing Race (Part No.382S)

    Bearing Race

    from

    $17.79
    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

    Best-Selling 1978 GMC K35 Differential Oil

    Upgrade your K35 with one of our 5 best-selling Differential Oil, earning an average 5 stars rating across 2 reviews.

    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 – 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

    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 Rear Differential Cover Gaskets for 1978 GMC K35s

    Choose a high-quality OEM or aftermarket Rear Differential Cover Gasket for GMC K35s and enjoy top-notch performance from $8.29.

    Felpro – Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket (Part No.RDS 6014)

    Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket

    from

    $17.99
    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
    • Unsurpassed quality you can trust
    • Validated for fit, form and function
    • Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
    See More

    Felpro – Axle Housing Cover Gasket: Irregular Shaped 14 Bolt Hole Gasket (Part No.RDS 55063)

    Axle Housing Cover Gasket: Irregular Shaped 14 Bolt Hole Gasket

    from

    $8.29
    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 – GM 10.5′ 14 Bolt Truck Cover Gasket (Part No.23016)

    GM 10.5' 14 Bolt Truck Cover Gasket

    from

    $13.99
    14T cover gasket.

    Product Features:
    • Cover gasket
    • Fits GM 10.5″ 14 bolt truck
    See More

    Victor Reinz – Differential Cover Gasket (Part No.71-14868-00)

    Differential Cover Gasket

    from

    $9.99
    With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

    Product Features:
    • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
    See More

    Top Picks for 1978 GMC K35 Differential Pinion Seals

    Invest in one of our 7 durable Differential Pinion Seals for your 1978 GMC, knowing you’re getting trusted brands and expert craftsmanship.

    National – Multi-Purpose Seal (Part No.9316)

    Multi-Purpose Seal

    from

    $17.49
    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:
    • Design type: spring loaded; multi-lip
    • Temperature range: -20 Deg. F to 300 Deg. F / -29 Deg. C to 49 Deg. C
    • Resistance to EP lubricants
    • Low swell in hydrocarbon fluids
    • Delivers quality and reliable performance for every type of repair
    See More

    Motive Gear – Differential Pinion Seal (Part No.9316)

    Differential Pinion Seal

    from

    $16.49
    Motive Gear offers some of the toughest drive train components on the market today. If you are looking for the largest line of performance ring and pinion gear options available with gear sets in a wide range of ratios for nearly every application, both on and off-road, check out Motive Gear. Motive Gear products can be found in the winner’s circle at racing events worldwide. The superior quality of Motive Gear components is the result of years of racing development, outstanding design and state-of-the-art manufacturing methods. Extensive testing is performed on all products by our in-house engineers.
    See More

    Yukon Gear – Replacement Pinion Seal For Dana 44HD, Dana 60 & Dana 70 (Part No.30208)

    Replacement Pinion Seal For Dana 44HD, Dana 60 & Dana 70

    from

    $39.99
    Replacement pinion seal for Dana 44HD, Dana 60 & Dana 70 .Yukon Mighty seal.

    Product Features:
    • Pinion seal
    • Pinion seal
    • Fits Dana Spicer 44HD, 60, 70, 70U and 70HD
    See More

    Yukon Gear – Pinion Seal For GM 14T (Part No.30023)

    Pinion Seal For GM 14T

    from

    $19.99
    Pinion seal for GM 14T.Yukon Mighty seal.

    Product Features:
    • Pinion seal
    • Fits 1998 and down GM 10.5″ 14 bolt truck
    See More

    FAG US – Shaft Seal (Part No.SS3147)

    Shaft Seal

    from

    $32.49
    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.SS3284)

    Shaft Seal

    from

    $26.49
    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

    Motive Gear – Differential Pinion Seal (Part No.5778V)

    Differential Pinion Seal

    from

    $18.49
    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

    Differential Covers for 1978 GMC K35s

    Make a smart move for your 1978 GMC K35 with products all priced from $59.99 to $288.99.

    Yukon Gear – Steel Cover For Dana 70 (Part No.32322)

    Steel Cover For Dana 70

    from

    $149.99
    Product Features:
    • Fits Dana Spicer 70
    • Steel
    See More

    Yukon Gear – Steel Cover For GM 10.5" 14 Bolt Truck (Part No.32345)

    Steel Cover For GM 10.5" 14 Bolt Truck

    from

    $92.99
    Product Features:
    • Fits GM 10.5″ 14 bolt truck
    • Steel
    See More

    Yukon Gear – Chrome Cover For 10.5" GM 14 Bolt Truck (Part No.32013)

    Chrome Cover For 10.5" GM 14 Bolt Truck

    from

    $59.99
    Chrome cover for GM 14T.

    Product Features:
    • Fits GM 10.5″ 14 bolt truck
    • Chrome
    See More

    Yukon Gear – Steel Cover For Dana 60 Standard Rotation (Part No.32321)

    Steel Cover For Dana 60 Standard Rotation

    from

    $114.99
    Product Features:
    • Fits standard rotation Dana Spicer 60
    • Steel
    See More

    Yukon Gear – Hardcore Diff Cover For Dana 50, Dana 60 & Dana 70 (Part No.32352)

    Hardcore Diff Cover For Dana 50, Dana 60 & Dana 70

    from

    $288.99
    Product Features:
    • Nodular iron for added strength
    • Thick design
    • Durable powder coat finish
    • Magnetic drain plug
    • Made in USA
    • High strength stainless steel fasteners
    See More

    Yukon Gear – Polished Aluminum Replacement Cover For Dana 60 (Part No.32024)

    Polished Aluminum Replacement Cover For Dana 60

    from

    $269.99
    Polished aluminum replacement cover for Dana 60 (standard rotation only).

    Product Features:
    • Fits standard rotation Dana Spicer 60
    • Finned polished aluminum
    See More

    Yukon Gear – Chrome Replacement Cover For Dana 60 And 61 Standard Rotation (Part No.32005)

    Chrome Replacement Cover For Dana 60 And 61 Standard Rotation

    from

    $89.99
    Chrome replacement cover for Dana 60 and 61(not reverse rotation!).

    Product Features:
    • Fits standard rotation Dana Spicer 60
    • Chrome
    See More

    Top-Rated Differential Brands For Your 1978 GMC K35

    When it comes to finding the perfect Differential for your 1978 GMC K35, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 14 trusted brands. We carry the most popular Differential brands including FELPRO, Richmond Gear, and National, and more, all known for their exceptional customer ratings (average brand rating of 4.6 stars) and competitive prices, as low as $8.29. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1978 GMC K35, providing peace of mind with parts that meet or exceed OEM standards.

    Popular FELPRO 1978 GMC K35 Differentials

    If you’re looking for a top-quality Differential for your 1978 GMC K35, Advance Auto Parts has exactly what you need with our selection of FELPRO Differentials. We have 2 FELPRO Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $8.29 and an average cost of $13.14, you’ll find the perfect Differential for your needs and budget. FELPRO Differentials for the 1978 GMC K35 come highly rated, with over 14 customer reviews and an impressive average rating of 4.6 stars. Choosing a FELPRO Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
    Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket
    from $17.99
    (1)
    Axle Housing Cover Gasket Irregular Shaped 10 Bolt Hole Gasket
    “OEM only uses silicone , the gasket set with a thin layer of silicone is a much better sealant method”

    Top-Quality Richmond Gear 1978 GMC K35 Differentials

    For those in search of a high-quality Differential for their 1978 GMC K35, Advance Auto Parts offers a great selection of Richmond Gear Differentials. With 1 Richmond Gear 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 $369.99, giving you a range of options to suit your budget. Backed by over 1 customer ratings and an average rating of 4.5 stars, Richmond Gear Differentials provide both reliability and excellent performance. Choosing a Richmond Gear Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
    Differential Ring And Pinion
    from $369.99
    (1)
    Differential Ring And Pinion
    “Be patient after install….may make bearing type noise the first few starts….after that smooth sailing!”

    FAQs for 1978 GMC K35 Differentials

    What are the best-selling Differentials for 1978 GMC K35s?

    Out of 303 Differentials that fit 1978 GMC K35s, the following parts are the top sellers:

    What’s the price range for 1978 GMC K35 Differentials?

    The prices of Differentials for the 1978 GMC K35 range from $1.89 up to $2,130.00 for the most premium parts.

    What is the average price of a Differential for a 1978 GMC K35?

    The average price for Differentials for the 1978 GMC K35 is $308.72. 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.

    What are the cheapest Differentials for my 1978 GMC K35?

    The cheapest 1978 GMC K35 Differentials we carry are:

    Does Advance Auto Parts sell Differentials for any other 1978 GMC models?

    Yes. We stock Differentials for 12 other popular 1978 GMC models. Some of the most popular are 1978 Jimmy Differentials, 1978 Caballero Differentials, 1978 K25 Differentials, 1978 K15 Differentials, and 1978 G25 Differentials.

    What types of Differentials do you sell for my 1978 GMC K35?

    As of 11/2/25, these are some of the most in-demand types of Differentials for a 1978 GMC K35:

    Can I get help with 1978 GMC K35 Differential orders?

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

    What is your return policy for GMC K35 Differentials?

    Advance Auto Parts keeps returns simple. For new GMC K35 Differentials and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.