1978 Mercury Cougar Differentials
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Richmond®Excel™ Ring and Pinion Gear SetMercury Cougar with Ford 9" Series Axle 1978, Excel™ Ring and Pinion Gear Set by Richmond®. Designed utilizing the latest technology, this product by Richmond features premium quality and will perform better than advertised. Perfect...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$238.99 - $284.99 - Motive Gear®Rear A-Line Ring and Pinion Gear SetMercury Cougar with 10 Bolt, Ford 9" Series Axle 1978, Rear A-Line Ring and Pinion Gear Set by Motive Gear®. Motive Gear stock performance ring and pinions are excellent replacements for OE. Experienced installers prefer ring and...Quiet operationComputer controlled heat treatment$192.04 - $227.17
- Auburn Gear®Grip-N-Loc™ Rear DifferentialMercury Cougar 1978, Grip-N-Loc™ Rear Differential by Auburn Gear®. Auburn Gear’s most advanced limited slip differential, the Grip-N-Loc™, builds upon exclusive technologies found in the previous limited slip line, but is...Upgrades vehicles for safe transfer of increased power/torque across the axleCase material is up to 50% stronger than OE cases$668.32 - $726.02
- Yukon Gear & Axle®High Performance Ring and Pinion Gear SetMercury Cougar 1978, High Performance Ring and Pinion Gear Set by Yukon Gear & Axle®. Yukon Ring and Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the...Smooth finishEasy Set-Up$378.89 - $1,999.89
- Spicer®Rear Mini SpoolMercury Cougar with 28 Spline, Ford 9" Series Axle 1978, Rear Mini Spool by Spicer®. Designed to replace the spider gears inside the differential case, Spicer mini spools are a fast, effective way to get full lock-up on the dirt track...Expertly crafted from premium materialsDesigned to match rigorous quality standards$52.40
- Spicer®Rear Third Member CaseMercury Cougar with 3.250" Carrier Bore, 35 Spline / 40 Spline 1978, Rear Third Member Case by Spicer®. Wherever limits are tested, Dana is there with products engineered to meet the needs of off-roaders, racers, and more. We offer...Expertly crafted from premium materialsDesigned to match rigorous quality standards$443.40
- Yukon Gear & Axle®Grizzly Locker™ Rear DifferentialMercury Cougar with Ford 9" Series Axle 1978, Grizzly Locker™ Rear Differential by Yukon Gear & Axle®. The Yukon Grizzly Locker is the ultimate in mechanical locking differentials for street, off-road, and drag racing. Grizzly Lockers...Available for many popular off-road & performance applicationsPatent pending design reduces common failures$899.89 - $1,180.89
- Yukon Gear & Axle®Rear Dropout HousingMercury Cougar with Ford 9" Series Axle 1978, Rear Dropout Housing by Yukon Gear & Axle®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium...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$612.89 - $826.89
- Yukon Gear & Axle®Rear Mini SpoolMercury Cougar with Ford 9" Series Axle 1978, Rear Mini Spool by Yukon Gear & Axle®. Mini spools are a low-cost traction option for vehicles looking for full-time lockup. The mini spool installs into a standard open carrier and give...Provides 100% traction to both wheels at all timesInstalls into standard open carrier case$54.89
- Yukon Gear & Axle®Trac Loc™ Rear DifferentialMercury Cougar with Ford 9" Series Axle 1978, Trac Loc™ Rear Differential by Yukon Gear & Axle®. Yukon took on this project by looking for ways to make it better. By designing a thicker 1541H billet hat that added more strength, they...Forged case and billet steel left case halfForged 4320 internals for maximum strength$795.89 - $799.89
- Richmond®Excel™ Rear Differential CarrierMercury Cougar Empty Case Housing with 4 Pinion Design, Ford 9" Series Axle 1978, Excel™ Rear Differential Carrier by Richmond®. Designed utilizing the latest technology, this product by Richmond features premium quality and will...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$288.08
- Richmond®Pro Gear Ring and Pinion Gear SetMercury Cougar 1978, Pro Gear Ring and Pinion Gear Set by Richmond®. Richmond Gear ring and pinions are perfect for any vehicle where performance and durability matters. Made from first-run steel, never recycled material, Richmond ring...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$462.60 - $719.99
- Richmond®Rear Street Gear Ring and Pinion Gear SetMercury Cougar with 10 Bolt, Ford 9" Series Axle 1978, Rear Street Gear Ring and Pinion Gear Set by Richmond®. Richmond Gear ring and pinions are perfect for any vehicle where performance and durability matters. Made from first-run...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$315.99 - $719.99
- AllStar Performance®SpoolMercury Cougar with Ford 9" Series Axle 1978, Spool by AllStar Performance®. Replace a troublesome positive traction unit with a high quality Allstar spool. Substantially lighter than conventional carriers, spools deliver equal power to...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$149.99 - $199.99
- Motive Gear®Performance Rear Ring and Pinion Gear SetMercury Cougar with Ford 9" Series Axle 1978, Performance Rear Ring and Pinion Gear Set by Motive Gear®. Motive Gear Performance ring and pinions are perfect for dedicated racing or off-road vehicle. Gear sets are made from first-run...Central contact patternCNC start to finish$303.99 - $853.99
- Motive Gear®Performance Rear Ring and Pinion Gear SetMercury Cougar with Ford 9" Series Axle 1978, Performance Rear Ring and Pinion Gear Set by Motive Gear®. Motive Gear Performance ring and pinions are perfect for dedicated racing or off-road vehicle. Gear sets are made from first-run...Central contact patternCNC start to finish$303.99 - $853.99
- Motive Gear®Rear Ring and Pinion Gear SetMercury Cougar with 10 Bolt, Ford 9" Series Axle 1978, Rear Ring and Pinion Gear Set by Motive Gear®. Motive Gear stock performance ring and pinions are excellent replacements for OE. Experienced installers prefer ring and pinions for...Quiet operationComputer controlled heat treatment$307.99 - $349.99
- Powertrax®Grip Pro Traction SystemMercury Cougar 1978, Grip Pro Traction System by Powertrax®. The Powertrax Grip Pro is a gear driven limited slip differential designed to be among the strongest and most durable in the industry. It combines the smooth operation of a...Comes Fully AssembledDelivers Progressive and Variable Traction$566.71 - $1,081.78
- Timken®Rear Differential Pinion SealMercury Cougar with 9.0" 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...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$11.81
- National®Rear Differential Pinion SealMercury Cougar with 9.0" Ring Gear, 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$12.58
- Timken®Rear Differential RaceMercury Cougar with 9.0" Ring Gear, 28 Splines Shaft 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...OE quality fit, performance, and reliabilityCost-effective friction management solution$6.76
- SKF®Rear Differential Rebuild KitMercury Cougar with 9.0" Ring Gear, 31 Spline Shaft 1978, Rear Differential Rebuild Kit by SKF®. Designed utilizing the latest technology, this product by SKF features premium quality and will perform better than advertised. Perfect for...Excellent replacement for your worn out or faulty partDesigned to restore original performance and reliability$126.69 - $138.89
- Yukon Gear & Axle®Rear Spider Gear SetMercury Cougar with Ford 9" Series Axle 1978, Rear Spider Gear Set by Yukon Gear & Axle®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium...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$283.89 - $487.89
- Yukon Gear & Axle®Rear Differential Master Overhaul KitMercury Cougar with Ford 9" Series Axle 1978, Rear Differential Master Overhaul Kit by Yukon Gear & Axle®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with...Most complete kits on the marketComplete overhaul package to rebuild differential$281.89 - $559.89
- Timken®Rear Differential BearingMercury 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$14.08 - $15.90
- Timken®Rear Differential Bearing and Seal KitMercury Cougar with 9.0" Ring Gear 1978, Rear 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$121.72 - $145.33
- Timken®Rear Differential Pinion BearingMercury Cougar with 9.0" Ring Gear, 28 Spline Shaft 1978, Rear Differential Pinion 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$37.97
- SKF®Rear Differential Pinion SealMercury Cougar 1978, Rear Differential Pinion Seal by SKF®. Designed utilizing the latest technology, this product by SKF features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Superior protection against dirt and waterManufactured with high-quality tested design and materials for correct fit$11.00
- SKF®Front Differential Bearing RaceMercury Cougar 1978, Front Differential Bearing Race by SKF®. Designed utilizing the latest technology, this product by SKF features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...Excellent replacement for your worn out or faulty partDesigned to restore original performance and reliability$4.93
- SKF®Rear Differential BearingMercury Cougar with 8.0" Ring Gear, GM Series Axle 1978, Rear Differential Bearing by SKF®. Do you feel shaking or shuddering when you engage the clutch; hear grinding noise when you shift gears? Does your engine race without an...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$13.77
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1978 Mercury Cougar Models
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