1978 Mercury Cougar Differentials & Components

Show items:
Sort by:
    • (0 reviews)
      # 111357712
      Mercury Cougar with 9" Ring Gear with Ford Series Axle with 28 Spline / with 31 Spline / with 35 Spline 1978, Rear Ring and Pinion Gear Set by USA Standard Gear®. USA Standard ring and pinion sets are the right choice to add confidence...
      Direct-fit OE-quality replacement for your factory partHelps restore the proper functionality of your vehicle
      $202.73 - $241.81
    • (0 reviews)
      # mpn2412746
      Mercury Cougar with 9" Ring Gear with 3.50 Ratio 1978, Rear Differential Ring and Pinion by Dorman®. The gears of Dorman’s Differential Ring and Pinion are engineered to effectively transfer torque from the driveshaft to the axles....
      Replacement eliminates driveline grinding and whining soundsDirect replacement for a proper fit
      $120.05
    • (0 reviews)
      # 68627030
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Master Overhaul Bearing Kit by USA Standard Gear®. USA Standard Master Overhaul kits let you finish your install with confidence. This kit uses Koyo bearings and races....
      Uses Koyo bearings and racesExpertly crafted from premium materials
      $149.38 - $225.27
    • (0 reviews)
      # mpn2020889
      Mercury Cougar with 9" Ring Gear 1978, Rear Axle Differential Bearing and Seal Kit by Timken®. Get optimum vehicle performance with Timken bearings. Timken manufactures ball bearings, cylindrical roller bearings, and tapered roller...
      Designed to effectively reduce frictionUltimate load handling capability
      $105.46
    • (0 reviews)
      # mpn2412745
      Mercury Cougar with 9" Ring Gear 1978, Rear Differential Bearing Kit by Dorman®. Dorman’s Differential Bearing Kit allows you to keep all the necessary components for installation of the Differential Ring and Pinion readily on hand....
      Replacement eliminates driveline grinding and whining soundsRobust steel construction ensures durability for years of service
      $223.35
    • (0 reviews)
      # mpn739976599
      Mercury Cougar with 9" Ring Gear with Ford Series Axle with 28 Spline / with 31 Spline with LM102949 Carrier Races 1978, Rear Differential Bearing Kit by USA Standard Gear®. This kit uses Koyo bearings and races along with all high...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $102.12
    • (0 reviews)
      # 68627217
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Mini Spool by USA Standard Gear®. Mini spools are a low-cost traction option for vehicles looking for full-time lockup. When it comes to a top-notch replacement for your...
      Installs into a standard open carrier caseProvides 100% traction to both wheels at all times
      $33.51
    • (0 reviews)
      # mpn739977057
      Mercury Cougar with 9" Ring Gear with Ford Series Axle with 28 Spline / with 31 Spline / with 35 Spline 1978, Rear Pinion Installation Kit by USA Standard Gear®. USA Standard ring and pinion sets are the right choice to add confidence...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $86.57
    • (0 reviews)
      # 68627173
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Spider Gear Set by USA Standard Gear®. USA Standard gear sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of gear sets...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $132.42 - $168.01
    • (0 reviews)
      # 68627242
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Spool by USA Standard Gear®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers...
      Provides 100% traction to both wheels at all timesNot recommended for street driven vehicles
      $112.60 - $188.86
    • (0 reviews)
      # mpn358588620
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Basic Series Differential Kit by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $15.44
    • (0 reviews)
      # mpn358588593
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle with 27 Pinion Spline 1978, Complete Series™ Differential Kit by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $73.46
    • (0 reviews)
      # mpn358588430
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Differential Installation Kit by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $36.17
    • (0 reviews)
      # mpn2040406
      Mercury Cougar 1978, Rear Differential Bearing by Timken®. Get optimum vehicle performance with Timken bearings. Timken manufactures ball bearings, cylindrical roller bearings, and tapered roller bearings, and all feature premium...
      Designed to effectively reduce frictionUltimate load handling capability
      $7.47
    • (0 reviews)
      # mpn2040421
      Mercury Cougar 1978, Rear Differential Bearing Set by Timken®. Get optimum vehicle performance with Timken bearings. Timken manufactures ball bearings, cylindrical roller bearings, and tapered roller bearings, and all feature premium...
      Designed to effectively reduce frictionUltimate load handling capability
      $9.33
    • (0 reviews)
      # mpn2040415
      Mercury Cougar with 9" Ring Gear with 28 Spline 1978, Rear Differential Pinion Pilot Bearing by Timken®. Get optimum vehicle performance with Timken bearings. Timken manufactures ball bearings, cylindrical roller bearings, and tapered...
      Designed to effectively reduce frictionUltimate load handling capability
      $21.60
    • (0 reviews)
      # mpn2054363
      Mercury Cougar with 9" Ring Gear 1978, Rear Differential Pinion Seal by Timken®. Timken offers the right seal to keep your vehicle running optimally. Timken seals provide ultimate protection from contaminants and help retain lubricants...
      Machined rubber sealing edge provides greater accuracy and consistency and a better sealing surfaceAn extra dust lip helps keep harmful contaminants out and protects against rust and corrosion
      $6.29
    • (0 reviews)
      # mpn2040405
      Mercury Cougar 1978, Rear Differential Race by Timken®. Precision manufactured using premium materials and made by the company that is trusted by many carmakers, the Timken race is the right choice if you opt for a highly durable part...
      OE quality fit, performance, and reliabilityCost-effective friction management solution
      $4.08
    • (0 reviews)
      # mpn2371034
      Mercury Cougar 1978, Differential Crush Sleeves by Dorman®. A necessary item to replace when servicing the differential, Dorman’s Differential Crush Sleeve is durably built to retain optimal pressure when the pinion gear nut is...
      Direct replacement for a proper fit every timeDesigned specifically for rear-wheel drive vehicles
      $2.93
    • (0 reviews)
      # mpn1248770
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Axle Differential Bearing by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer controlled heat treatment...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $7.61
    • (0 reviews)
      # mpn1248769
      Mercury Cougar with 9" Ring Gear with Ford Transmission 1978, Rear Axle Differential Bearing Race by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $3.99
    • (0 reviews)
      # mpn1848347674
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Axle Standard Differential Bearing and Seal Kit by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer...
      Spindle bearing and seal kitIncludes all components required to complete the repair
      $90.86
    • (0 reviews)
      # mpn1290825
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Differential Pinion Bearing With 0.0310" Cone Radius by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $8.07
    • (0 reviews)
      # mpn1848355976
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Differential Pinion Pilot Bearing by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer controlled heat...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $20.78
    • (0 reviews)
      # mpn1269738
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Differential Pinion Race Cup by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform optimally....
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $4.34
    • (0 reviews)
      # mpn1179151
      Mercury Cougar with 9" Ring Gear with Ford Transmission 1978, Rear Differential Pinion Repair Sleeve by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform...
      National Redi-Sleeves are precision stainless steel wear sleeves designed to quickly repair damaged, grooved or worn shaftsStrong, durable stainless steel construction provides a corrosion-free sealing surface that surpasses most original shaft specifications
      $19.44
    • (0 reviews)
      # mpn1307894
      Mercury Cougar with 9" Ring Gear with Ford Series Axle 1978, Rear Differential Pinion Seal by National®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with...
      National oil seals are recognized worldwide for their quality and reliable performance for every type of repair.Design Type: Spring Loaded; Multi-Lip
      $6.97
    • (0 reviews)
      # mpn358588599
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, 0.620" Crush Sleeve by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it the...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $3.81
    • (0 reviews)
      # mpn358588576
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle with 25 Spline 1978, Differential Bearing Kit With Pinion 10-Bolt by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $52.87
    • (0 reviews)
      # mpn358588627
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Differential Bearing Spacer With Shim Pack by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $12.60
    • (0 reviews)
      # mpn358588671
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Differential Carrier Bearing Set by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $23.31
    • (0 reviews)
      # mpn358588658
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle with 30 Pinion Spline 1978, Differential Pinion Bearing by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $19.09
    • (0 reviews)
      # mpn358588466
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Differential Pinion Nut by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $2.43
    • (0 reviews)
      # mpn358588439
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Pinion Shim Set by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it the...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $8.69
    • (0 reviews)
      # mpn358588458
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Ring Gear Bolt Set by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it the...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $14.70
    • (0 reviews)
      # mpn358588434
      Mercury Cougar with 7.5" Ring Gear with General Motors Series Axle 1978, Smart Sleeve Crush Sleeve by Ratech®. Designed with precision and functionality in mind, this accessory ensures outstanding performance and easy use which makes it...
      OEM design and manufacturing ensure top qualityCrafted from prime materials for long-term service
      $9.61
    • (0 reviews)
      # mpn4520787122
      Mercury Cougar with 8" Ring Gear 1978, Differential Carrier Gasket With 10 Bolt Holes by Victor Reinz®. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $3.28
    • (0 reviews)
      # mpn4554624314
      Mercury Cougar with 9" Ring Gear with Ford Transmission 1978, Rear Differential Carrier Gasket by Fel-Pro®. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies...
      Direct OEM replacement for a proper fitEnsures reliable sealing performance
      $4.11
    • (0 reviews)
      # mpn4515297019
      Mercury Cougar with Ford 9" Series Axle 1978, Differential Cross Pin by AllStar Performance®. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will perform better than...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $14.99
    • (0 reviews)
      # mpn4515291619
      Mercury Cougar with Ford 9" Series Axle 1978, Differential Pinion Nut by AllStar Performance®. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will perform better than...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $4.99
    • (0 reviews)
      # mpn4515297149
      Mercury Cougar with Ford 9" Series Axle 1978, Differential Pinion Seal by AllStar Performance®. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will perform better than...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $7.99
    • (0 reviews)
      # 990450767
      Mercury Cougar with Ford 9" Series Axle with 10 Bolt 1978, Mini Spool by AllStar Performance®. Lightweight. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will perform better...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $29.99
    • (0 reviews)
      # 990395138
      Mercury Cougar with 9" Series Axle with 10 Bolt 1978, Ring and Pinion Gear Set by AllStar Performance®. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or birth defects or other...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $149.99
    • (0 reviews)
      # 1146010349
      Mercury Cougar with Ford 9" Series Axle 1978, Ring and Pinion Installation Bearing Kit by AllStar Performance®. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will perform...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $98.99 - $128.99
    • (0 reviews)
      # mpn4515297071
      Mercury Cougar with Ford 8" Series Axle 1978, Ring and Pinion Installation Shim Kit by AllStar Performance®. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or birth defects or...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $36.99
    • (0 reviews)
      # mpn4515297068
      Mercury Cougar with Ford 9" Series Axle 1978, Ring and Pinion Installation Shim Kit with Crush Sleeve by AllStar Performance®. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $27.99
    • (0 reviews)
      # mpn4515297067
      Mercury Cougar with Ford 9" Series Axle 1978, Ring and Pinion Installation Shim Kit with Solid Spacer by AllStar Performance®. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $37.99
    • (0 reviews)
      # 1016946479
      Mercury Cougar with Ford 9" Series Axle 1978, Spool by AllStar Performance®. CA Prop 65 WARNING - This product contains chemicals known to the State of California to cause cancer, and/or birth defects or other reproductive harm.
      $137.99 - $204.99
    • (0 reviews)
      # 1017015827
      Mercury Cougar with Ford 9" Series Axle 1978, with Installed Races Differential Pinion Suppport by AllStar Performance®. Designed utilizing the latest technology, this product by AllStar Performance features premium quality and will...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $119.99 - $148.99
    • (0 reviews)
      # mpn4517165885
      Mercury Cougar Base / XR-7 5.0L / 6.6L with 28 Spline with Ford 7.5" Series Axle with 10 Bolt 1978, HP™ Rear Limited Slip Differential by Auburn Gear®. High Performance. Auburn Gear’s flagship limited-slip differential gives you...
      Expertly crafted from superior materialsProvides exceptional reliability
      $447.98
    • (1 review)
      # 1029242622
      Mercury Cougar Base / XR-7 5.0L / 6.6L with 10 Bolt 1978, Pro™ Rear Limited Slip Differential by Auburn Gear®. Turns your torque up another notch, offering an even higher bias ratio and faster sensing reaction than HP for the very...
      Expertly crafted from superior materialsProvides exceptional reliability
      $506.74 - $526.32
    • (0 reviews)
      # 503442088
      Mercury Cougar Base / XR-7 5.0L / 6.6L with 10 Bolt 1978, Rear Differential Spring Retainer Service Kit by Auburn Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and...
      Enables you to keep your engine in the powerband for more giddy-up and high speedAllows for getting superior traction on just about any brutal terrain
      $108.69 - $120.44
    • (0 reviews)
      # 1091477711
      Mercury Cougar with 31 Spline with Ford 9" Series Axle 1978, Rear Differential Locker by Aussie Locker®. The Aussie Locker is the most advanced "traction added" Automatic Precision Locker in the world today. Specifically designed for...
      High quality at an affordable priceExpertly made from premium materials
      $333.02
    • (0 reviews)
      # mpn4517169130
      Mercury Cougar with 31 Spline with Ford 9" Series Axle 1978, Rear Differential Locker Pin and Spring Kit by Aussie Locker®. Dominate the track or hit the trails with condidence by fine tuning your vehicle for neck-breaking speed and...
      High quality at an affordable priceExpertly made from premium materials
      $35.40
    • (0 reviews)
      # 503545370
      Mercury Cougar 1978, Differential Bearing Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo rigid quality control...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $84.31 - $150.76
    • (0 reviews)
      # mpn4517170190
      Mercury Cougar with 9" Series Axle with 10 Bolt 1978, Differential Carrier Shim Kit by Motive Gear®. With Solid Spacer. All Motive Gear products are engineered for their specific application and manufactured in state of the art...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $25.53
    • (0 reviews)
      # 1029226627
      Mercury Cougar 1978, Differential Gear Installation Kit by Motive Gear®. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All of company products undergo rigid...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $32.45 - $37.61
    • (0 reviews)
      # 503566084
      Mercury Cougar with Factory Pinion Support with Ford 9" Series Axle with 2.891" Race Diameter 1978, Differential Pinion Bearing Kit by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $66.60 - $69.56
    • (0 reviews)
      # mpn4517169069
      Mercury Cougar with 2 Pinion Gear with Ford 9" Series Axle 1978, Differential Pinion Shaft by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $14.09
    • (0 reviews)
      # mpn4517170065
      Mercury Cougar with Ford 9" Series Axle 1978, Differential Pinion Shim Pack by Motive Gear®. With Solid Spacer. All Motive Gear products are engineered for their specific application and manufactured in state of the art facilities. All...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $32.31




    Popular Products

    1978 Mercury Cougar Models


    Low Prices Price match guarantee
    Guaranteed Fitment Always the correct part
    In-House Experts We know our products
    Easy Returns Quick & Hassle Free

    All manufacturer names, symbols, and descriptions, used in our images and text are used solely for identification purposes only. It is neither inferred nor implied that any item sold by CARiD.com is a product authorized by or in any way connected with any vehicle manufacturers displayed on this page.

    SECURE SHOPPING