1977 Mercury Cougar Differentials

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Keep Your 1977 Mercury Cougar in Top Shape with Quality Differentials

Whether you’re repairing or upgrading your Differential, using high-quality parts is key to keeping your 1977 Mercury Cougar looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Differential Bearings, Rear Differential Cover Gaskets, and Differential Ring Gear Bolts. 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 Powertrax, Felpro, and National. For example, Powertrax Differentials start at just $551.99 with an average 4.7 star rating. Felpro and National offer similar pricing and quality, backed by strong customer feedback. With over 572 reviews and a solid 4 star average, you can shop with confidence knowing other Mercury Cougar owners approve.

Explore Related Parts

While you’re upgrading or replacing your Differential, don’t forget to check out other key components like Drive Shafts and Axles and Universal Joints. At Advance Auto Parts, we’re here to help you keep your 1977 Mercury Cougar in peak condition, inside and out.

Essential 1977 Mercury Cougar Differentials

Yukon Gear – Standard Open Carrier Case – Ford 9" (Part No.20078)

Standard Open Carrier Case - Ford 9"

from

$264.99
9″ standard Open case, bare, 28 & 31 spline, 2 or 4 pinion.

Product Features:
  • Standard open carrier case
  • Fits Ford 9″ with 28 or 31 spline axles
  • Does not include spider gears
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USA Standard Gear – Master Overhaul Kit for the Ford 9" LM501310 Differential (Part No.37035)

Master Overhaul Kit for the Ford 9" LM501310 Differential

from

$213.99
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.

Product Features:
  • Fits Ford 9″ with LM501310 carrier race
  • Uses Koyo bearings and races
  • Included are carrier bearings and races, pinion bearings and races, pilot bearing, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and gasket.
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Yukon Gear – Chrome Moly Cross Pin Shaft For Mini-Spool For 9" Ford (Part No.32235)

Chrome Moly Cross Pin Shaft For Mini-Spool For 9" Ford

from

$61.99
Chrome Moly cross pin shaft for Mini-Spool for 9″ Ford HD.

Product Features:
  • Cross pin shaft
  • Fits Ford 9″
  • Chromoly steel for added strength
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Yukon Gear – One (1) Specialty Bearing Race To Adapt Small Bearing Journal Into A 3.250" Dropout (Part No.32157)

One (1) Specialty Bearing Race To Adapt Small Bearing Journal Into A 3.250" Dropout

from

$51.99
One (1) specialty bearing race to adapt small bearing journal into a 3.250″ dropout. This adapter allows the use of a 28 or 31 spline carrier, positraction or locker in a 3.250″ dropout. This is a perfect solution if you are currently running 28 or 31 spline axles but are looking to upgrade to 35 spline later, or are stepping down from 35 spline but don’t want to buy a new dropout.

Product Features:
  • Carrier race
  • Fits Ford 9″
  • Conversion race to install small bearing carrier into 3.250″ dropout
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Richmond Gear – Differential Cross Shaft (Part No.CSPF9)

Differential Cross Shaft

from

$26.49
Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND!

Product Features:
  • For over 80-years, the Richmond Double-Diamond logo has represented some of the highest quality gears in the racing industry. Winners Run Richmond!
  • The superior quality of Richmond gearsets is a result of outstanding design, world class manufacturing and an extensive testing process that is performed on all products.
  • Richmond performance gearsets have been winners for decades at: NHRA, NMRA, NMCA, Daytona 500, WISSOTA and U.S. Nationals.
  • Richmond Gear is a leading manufacturer of high performance ring and pinion gearsets and drivetrain components, backed by a two year warranty.
  • Engineered to perform faster and be more reliable, Richmond performance drivetrain products are the result of a continuous research and development program combined with state-of-the-art manufacturing capabilities.
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Yukon Gear – The Carrier Bearing Puller (Part No.56034)

The Carrier Bearing Puller

from

$689.99
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 most standard one ton applications. This unit is works with differentials up to one-ton applcations. It is not compatible with 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
  • Not compatible with Dana 70HD, Dana 80, Ford 10.25″ and 10.5″ or Gm and Chrysler 11.5″ applications
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Yukon Gear – Master Overhaul Kit For ’09 & Down Ford 8.8" Differential (Part No.14050)

Master Overhaul Kit For '09 & Down Ford 8.8" Differential

from

$289.99
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 2009 and down Ford 8.8″
  • 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.
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Felpro – Differential Carrier Gasket Oval Shaped 10 Bolt Hole Gasket (Part No.RDS 55074)

Differential Carrier Gasket Oval Shaped 10 Bolt Hole Gasket

from

$9.99
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
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Yukon Gear – 3.062" Side Adjuster For Ford 9" (Part No.32139)

3.062" Side Adjuster For Ford 9"

from

$94.99
3.062″ side adjuster, Only Fits Yukon Ford 9″ Drop Out, new design ONLY.

Product Features:
  • Side adjuster
  • Fits Ford 9″
  • 3.062″ designs only
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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
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Yukon Gear – 3 Qt – 80W90 Conventional Gear Oil With Posi Additive (Part No.15003)

3 Qt - 80W90 Conventional Gear Oil With Posi Additive

from

$57.99
3 Qt. Penzoil 80W90 conventional gear Oil. W/ bottle of Posi additive.

Product Features:
  • Includes three quarts of conventional oil and one 4oz bottle of Yukon positraction additive
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USA Standard Gear – Spool For Ford 9", 35 Spline (Part No.59025)

Spool For Ford 9", 35 Spline

from

$294.99
9″ FORD 35Spline SPOOL 30deg (EXCL M.WLMS) 2-3/16″ DECK , 2″ Journal .

Product Features:
  • Fits Ford 9″ with 35 spline axles
  • Provides 100% traction to both wheels at all times
  • Not recommended for street driven vehicles
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Powertrax – Lock Right Locker (Part No.1821-LR)

Lock Right Locker

from

$441.99
The Powertrax Lock-Right ultra-strength alloy locker’s straight-line performance is equal to a solid spool, but automatically unlocks in turns. Best suited for extreme off-road to severe on-road use, Powertrax Lock Right lockers replace the spider gears in your open differential carrier using basic tools and without affecting your ring and pinion settings. The whole job can be done in your driveway in a couple of hours, pin included! 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!
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    Yukon Gear – Extra HD 3.062" Nodular Iron Dropout For Ford 9" (Part No.32099)

    Extra HD 3.062" Nodular Iron Dropout For Ford 9"

    from

    $615.99
    Yukon Extra HD 3.062″ nodular Iron dropout for Ford 9″. Yukon nodular iron dropouts feature a 5/8″ cap bolt and forged caps for maximum strength. Rated up to 1200HP!

    Product Features:
    • Fits Ford 9″
    • 3.062″ carrier race diameter
    • Nodular iron for added strength
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    Yukon Gear – Standard Open & Tracloc Pinion Gear And Thrust Washer For 7.5" Ford (Part No.33296)

    Standard Open & Tracloc Pinion Gear And Thrust Washer For 7.5" Ford

    from

    $10.99
    Standard Open & TracLoc pinion gear thrust washer for 7.5″ Ford.

    Product Features:
    • Pinion gear thrust washer
    • Fits Ford 7.5″
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    Yukon Gear – Side Gear And Thrust Washer (0.875" Shaft) For 8.8" Ford (Part No.33300)

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

    from

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

    Product Features:
    • Side gear thrust washer for Ford 8.8″
    • 0.875″ diameter cross pin shaft applications only
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    Yukon Gear – Trac Loc For Ford 9" Wtih 28 Spline Axles – Aggressive Design (Part No.26007)

    Trac Loc For Ford 9" Wtih 28 Spline Axles - Aggressive Design

    from

    $821.99
    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 Trac Loc uses a nodular case, billet side hat, and forged internals for higher strength than stock Trac-Locs. The units use composite clutches for high performance and long life. All units are Rebuildable. Yukon offers a one year warranty against manufacturing defects.

    Product Features:
    • Fits Ford 9″ with 28 spline axles
    • Trac Loc positraction
    • Clutch style positraction
    • Aggressive design
    • Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
    • Fully rebuildable
    • Assembled in the USA
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    Motive Gear – Differential Lock Thrust Block (Part No.D3SZ4211A)

    Differential Lock Thrust Block

    from

    $47.49
    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.
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    Yukon Gear – Trac Loc Spring Plate For Ford 9" & 8" (Part No.33517)

    Trac Loc Spring Plate For Ford 9" & 8"

    from

    $10.99
    Product Features:
    • Trac Loc spring plate for Ford 8″ and 9″
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    Yukon Gear – Pinion Nut (Part No.33154)

    Pinion Nut

    from

    $7.99
    Pinion nut for Ford 7.5″, 8″, 8.8″, 9 3/8″ & 9″. 1 1/6″ socket, 3/4″ x 20 thread.

    Product Features:
    • Pinion nut for Ford 7.5″, 8″ and 9″
    • 3/4″ x 20 thread
    • 1 1/6″ socket
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    Yukon Gear – Standard Open Spider Gear Kit For 8" And 9" Ford With 28 Spline Axles And 2-Pinion Design (Part No.16031)

    Standard Open Spider Gear Kit For 8" And 9" Ford With 28 Spline Axles And 2-Pinion Design

    from

    $285.99
    Yukon standard open spider gear kit for 8″ and 9″ Ford with 28 spline axles and 2-pinion design. 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 Ford 8″ and 9″ open differential with 28 spline axles
    • Includes two side gears, two pinion gears, cross pin shaft, roll pins and spider gear thrust washers.
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    Motive Gear – Differential Pinion Solid Spacer Kit w/Shims (Part No.4104)

    Differential Pinion Solid Spacer Kit w/Shims

    from

    $10.49


    Product Features:
    • SOLID SPACER FORD 8.8″ & 9″
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    Yukon Gear – Purple Aluminum Pinion Support For 9" Ford Daytona (Part No.32036)

    Purple Aluminum Pinion Support For 9" Ford Daytona

    from

    $264.99
    Product Features:
    • Fits Ford 9″ with 28 spline pinion
    • Larger inner pinion bearing reduces gear deflection under high load
    • Races installed
    • 6061 aluminum
    • Annodized purple
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    Motive Gear – Differential Gear Install Kit (Part No.F8IK)

    Differential Gear Install Kit

    from

    $44.49
    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

    Yukon Gear – 8.8" Ford Tracloc Clutch Set, Both Sides (Part No.16017)

    8.8" Ford Tracloc Clutch Set, Both Sides

    from

    $207.99
    8.8″ Ford TracLoc (with long ears–for early models only) clutch set, both sides.

    Product Features:
    • Clutch kit
    • Fit Ford 8.8″ Trac Loc positraction
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    Yukon Gear – Pinion Install Kit For Ford 8.8" Differential (Part No.13041)

    Pinion Install Kit For Ford 8.8" Differential

    from

    $167.99
    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, pinion nut, 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 2009 and down Ford 8.8″
    • Included are pinion bearings and races, pinion seal, crush sleeve , complete pinion shim kit, and marking compound with brush.
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    Yukon Gear – Ford 7.5" & 8.8" Ring Gear Bolt, Standard Open & Tracloc (Part No.33053)

    Ford 7.5" & 8.8" Ring Gear Bolt, Standard Open & Tracloc

    from

    $5.99
    Ford 7.5″ & 8.8″ ring gear bolt, standard Open & TracLoc. 7/16″ x 20.

    Product Features:
    • Ring gear bolt for Ford 7.5″ and 8.8″
    • 7/16″ x 20
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    Yukon Gear – 9" Ford Gasket (Part No.23012)

    9" Ford Gasket

    from

    $11.99
    9″ Ford gasket.

    Product Features:
    • Dropout gasket
    • Fits Ford 9″
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    Most Popular Differential Bearings for 1977 Mercury Cougars

    Enhance your 1977 Mercury Cougar with one of the 3 Differential Bearings we have in stock, starting at just $11.99.

    National – Multi-Purpose Bearing (Part No.A-18)

    Multi-Purpose Bearing

    from

    $17.99
    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

    Driveworks – Taper Bearing Cone (Part No.S-LM-102949)

    Taper Bearing Cone

    from

    $15.49
    Value-priced bearing meets all cataloged application requirements.

    Product Features:
    • Brand may vary by location
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    Yukon Gear – Pilot Bearing Retainer For Ford 9" (Part No.33255)

    Pilot Bearing Retainer For Ford 9"

    from

    $11.99
    Pilot bearing retainer for Ford 9″.

    Product Features:
    • Pilot bearing retainer for Ford 9″
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    Best-Selling 1977 Mercury Cougar Rear Differential Cover Gaskets

    Upgrade your Cougar with one of our 2 best-selling Rear Differential Cover Gaskets.

    Yukon Gear – 9" Ford Gasket (Part No.23012)

    9" Ford Gasket

    from

    $11.99
    9″ Ford gasket.

    Product Features:
    • Dropout gasket
    • Fits Ford 9″
    See More

    Mr. Gasket – Rear End Gasket – Ford 9" – Blend Of Nitrile Rubber And Fiber For Excellent Sealing And Durability (Part No.82)

    Rear End Gasket - Ford 9" - Blend Of Nitrile Rubber And Fiber For Excellent Sealing And Durability

    from

    $25.99
    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. Fits 1957-1981 Ford 10 bolt 9 inch ring gear.

    Product Features:
    • .047″ thick cellulose/nitrile composite gasket material
    • Precision die cut
    • Reusable
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    Top-Quality Differential Ring Gear Bolts for 1977 Mercury Cougars

    Choose a high-quality OEM or aftermarket Differential Ring Gear Bolt for Mercury Cougars and enjoy top-notch performance from $1.99.

    Yukon Gear – Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt (Part No.33058)

    Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt

    from

    $5.99
    Ford 8″ & 9″ standard Open, AG, & Detroit locker ring gear bolt. 7/16″ head, .925″ long.

    Product Features:
    • Ring gear bolt for Ford 8″ and 9″
    • For use with standard open carrier, Auburn Gear limited slip and Detroit Locker
    • 7/16″ head
    • .925″ long
    See More

    Yukon Gear – Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt (Part No.33043)

    Ford 8" & 9" Standard Open, Ag, & Detroit Locker Ring Gear Bolt

    from

    $5.99
    Ford 8″ & 9″ standard Open, AG, & Detroit locker ring gear bolt, 1.0″ long, Ford.

    Product Features:
    • Ring gear bolt for Ford 8″ and 9″
    • For use with standard open carrier, Auburn Gear limited slip and Detroit Locker
    • 1.0″ long
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    Yukon Gear – Ford 8" & 9" Tracloc Ring Gear Bolt (Part No.33044)

    Ford 8" & 9" Tracloc Ring Gear Bolt

    from

    $4.99
    Ford 8″ & 9″ TracLoc ring gear bolt, 1-1/4″ long.

    Product Features:
    • Ring gear bolt for Ford 8″ and 9″
    • For use with Trac Loc limited slip
    • 1.25″ long
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    Motive Gear – Ring Gear Bolt (Part No.D8OZ4216B)

    Ring Gear Bolt

    from

    $1.99


    Product Features:
    • BOLT 9″ FORD OPEN R.G. SAME AS M-4216A200
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    ARP Auto Racing – For Use With Ford 9" Using 5/8"Socket, 0.94"L Under Head, 7/16"-20, 12Point Head (Part No.250-3002)

    For Use With Ford 9" Using 5/8"Socket, 0.94"L Under Head, 7/16"-20, 12Point Head

    from

    $43.99
    The tremendous shock loads generated at launch by most any drag racing vehicle equipped with today sticky tire compounds or the acceleration and deceleration of oval track cars put considerable strain on the ring gear. For this reason, the fastener experts at ARP have developed the Pro Series ring gear bolts. they are forged from premium grade 8740 chrome moly steel and are heat treated to a nominal rating of 200,000 PSI tensile strength. Specially hardened, precision ground washers are included where required. Available to fit most any ring gear setup ranging from popular 9 Inch Ford GM 10 and 12 bolt rear ends to the beefy strange differentials found in top fuel and funny car applications.

    Product Features:
    • Forged From Premium Grade 8740 Chrome Moly Steel
    • Heat Treated
    • Nominally Rated At 200,000 PSI Tensile Strength
    • Specially Hardened, Precision Ground Washers
    • 0.95″ Underhead Length
    • 200,000 PSI
    • Sold As A Set
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    Yukon Gear – Trac Loc Ring Gear Bolt Washer For 8" And 9" Ford (Part No.33245)

    Trac Loc Ring Gear Bolt Washer For 8" And 9" Ford

    from

    $3.99
    Trac Loc ring gear bolt washer for 8″ and 9″ Ford.

    Product Features:
    • Ring gear bolt for Ford 8″ and 9″
    • For Trac Loc positraction applications only
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    Top Picks for 1977 Mercury Cougar Differential Pinion Seals

    Invest in one of our 3 durable Differential Pinion Seals for your 1977 Mercury, knowing you’re getting trusted brands and expert craftsmanship.

    Yukon Gear – Pinion Seal For ’61-’85 9" Ford (Part No.30137)

    Pinion Seal For '61-'85 9" Ford

    from

    $17.99
    Pinion seal for ’61-’85 9″ Ford. 3″ OD.Yukon Mighty seal.

    Product Features:
    • Pinion seal
    • Fits 1961-1985 Ford 9″
    • 3.00″ O.D.
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    Schaeffler – Shaft Seal (Part No.SS2934)

    Shaft Seal

    from

    $21.79
    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
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    Motive Gear – Differential Pinion Seal (Part No.7044NA)

    Differential Pinion Seal

    from

    $12.99
    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!
    See More

    Differential Oil for 1977 Mercury Cougars

    Make a smart move for your 1977 Mercury Cougar with products all priced from $44.99 to $148.99.

    Yukon Gear – 3 Qt – 80W90 Conventional Gear Oil With Posi Additive (Part No.15003)

    3 Qt - 80W90 Conventional Gear Oil With Posi Additive

    from

    $57.99
    3 Qt. Penzoil 80W90 conventional gear Oil. W/ bottle of Posi additive.

    Product Features:
    • Includes three quarts of conventional oil and one 4oz bottle of Yukon positraction additive
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    Yukon Gear – 3 Qt – Penzoil 80W90 Conventional Gear Oil (Part No.15002)

    3 Qt - Penzoil 80W90 Conventional Gear Oil

    from

    $44.99
    3 Qt. Penzoil 80W90 conventional gear Oil.

    Product Features:
    • Includes three quarts of conventional oil
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    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
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    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-Rated Differential Brands For Your 1977 Mercury Cougar

    When it comes to finding the perfect Differential for your 1977 Mercury Cougar, 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 Powertrax, Felpro, and National, and more, all known for their exceptional customer ratings (average brand rating of 4.7 stars) and competitive prices, as low as $9.99. Purchasing a Differential from us here at Advance Auto Parts is a smart move for both you and your 1977 Mercury Cougar, providing peace of mind with parts that meet or exceed OEM standards.

    Popular Powertrax 1977 Mercury Cougar Differentials

    If you’re looking for a top-quality Differential for your 1977 Mercury Cougar, Advance Auto Parts has exactly what you need with our selection of Powertrax Differentials. We have 1 Powertrax Differentials in stock for this fitment, all known for their durability and precision fit. With prices starting at just $551.99, you’ll find the perfect Differential for your needs and budget. Powertrax Differentials for the 1977 Mercury Cougar come highly rated, with over 1 customer reviews and an impressive average rating of 4.7 stars. Choosing a Powertrax Differential from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
    No-Slip Traction System
    from $551.99
    (1)
    No-Slip Traction System
    “Installed, no issues, works great.”

    Top-Quality Felpro 1977 Mercury Cougar Differentials

    For those in search of a high-quality Differential for their 1977 Mercury Cougar, Advance Auto Parts offers a great selection of Felpro Differentials. With 1 Felpro 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 $9.99, giving you a range of options to suit your budget. Backed by over 9 customer ratings and an average rating of 4.6 stars, Felpro Differentials provide both reliability and excellent performance. Choosing a Felpro Differential from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
    Differential Carrier Gasket Oval Shaped 10 Bolt Hole Gasket
    from $9.99
    (9)
    Differential Carrier Gasket Oval Shaped 10 Bolt Hole Gasket
    “Right fit the first time.”

    FAQs for 1977 Mercury Cougar Differentials

    What are the best-selling Differentials for 1977 Mercury Cougars?

    Out of 304 Differentials that fit 1977 Mercury Cougars, the following parts are the top sellers:

    What’s the price range for 1977 Mercury Cougar Differentials?

    The prices of Differentials for the 1977 Mercury Cougar range from $1.99 up to $1,566.99 for the most premium parts.

    What is the average price of a Differential for a 1977 Mercury Cougar?

    The average price for Differentials for the 1977 Mercury Cougar is $267.14. 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 Cougar model years?

    Yes, we carry Differentials for 33 model years of Mercury Cougars between 1967 and 2002. The following model years are the most popular for Differential purchases: 2002, 2001, 2000, 1999, 1997, 1996, 1995, 1994, and 1993.

    What are the cheapest Differentials for my 1977 Mercury Cougar?

    The cheapest 1977 Mercury Cougar Differentials we carry are:

    Does Advance Auto Parts sell Differentials for any other 1977 Mercury models?

    Yes. We stock Differentials for 5 other popular 1977 Mercury models. Some of the most popular are 1977 Grand Marquis Differentials, 1977 Capri Differentials, 1977 Marquis Differentials, 1977 Comet Differentials, and 1977 Monarch Differentials.

    What types of Differentials do you sell for my 1977 Mercury Cougar?

    As of 3/1/26, these are some of the most in-demand types of Differentials for a 1977 Mercury Cougar:

    Can I get help with 1977 Mercury Cougar 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 Cougar Differentials?

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