1978 Mercury Marquis Differentials & Components

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    • (0 reviews)
      # 531105387
      Mercury Marquis 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. It's robust steel construction...
      Replacement eliminates driveline grinding and whining soundsDirect replacement for a proper fit
      $117.67 - $191.95
    • (0 reviews)
      # 531077328
      Mercury Marquis 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 bearings, and all...
      Designed to effectively reduce frictionUltimate load handling capability
      $61.59 - $104.67
    • (0 reviews)
      # mpn2412745
      Mercury Marquis 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)
      # 531168663
      Mercury Marquis 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 - $10.17
    • (0 reviews)
      # mpn2040421
      Mercury Marquis with 9" Ring Gear 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...
      Designed to effectively reduce frictionUltimate load handling capability
      $9.33
    • (0 reviews)
      # mpn2040415
      Mercury Marquis with 9" Ring Gear with WDC Series Axle / with WDD Series Axle / with WDL Series Axle / with WFG Series Axle 1978, Rear Differential Pinion Pilot Bearing by Timken®. Get optimum vehicle performance with Timken bearings....
      Designed to effectively reduce frictionUltimate load handling capability
      $21.60
    • (0 reviews)
      # 531145267
      Mercury Marquis 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 and liquids,...
      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 - $10.10
    • (0 reviews)
      # 531088619
      Mercury Marquis 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 - $5.38
    • (0 reviews)
      # mpn2371034
      Mercury Marquis 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 Marquis with 8.7" Ring Gear / 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...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $7.61
    • (0 reviews)
      # mpn1248769
      Mercury Marquis with 8.7" Ring Gear / 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...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $3.99
    • (0 reviews)
      # 531132011
      Mercury Marquis with Ford Series Axle 1978, Rear Differential Pinion Bearing by National®. This bearing is manufactured from high quality steel and constructed utilizing state-of-the-art computer controlled heat treatment technology to...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $8.07 - $10.74
    • (0 reviews)
      # mpn1848355976
      Mercury Marquis 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)
      # 531079358
      Mercury Marquis with Ford Series Axle 1978, Rear Differential Pinion Race by National®. This part is manufactured by one of the most trusted names in the automotive industry to keep your vehicle perform optimally. It is built to the...
      Premium bearing design matches OEM specificationsPrecision manufactured using premium-grade steel for outstanding durability and performance
      $4.34 - $5.68
    • (0 reviews)
      # 531067407
      Mercury Marquis 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 optimally. It is built...
      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)
      # 531145223
      Mercury Marquis 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 customers in...
      Designed to increase wheel-end reliability by effectively excluding dirt, moisture, and other contaminantsA patent-pending National Dynamic Edge technology allows for maximum protection
      $6.97 - $9.47
    • (0 reviews)
      # mpn4554624314
      Mercury Marquis 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...
      Direct OEM replacement for a proper fitEnsures reliable sealing performance
      $4.11
    • (0 reviews)
      # mpn4515297019
      Mercury Marquis 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 Marquis 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 Marquis 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)
      # 990400385
      Mercury Marquis 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)
      # 990394898
      Mercury Marquis 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...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $149.99
    • (0 reviews)
      # 1145667358
      Mercury Marquis 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 Marquis 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 Marquis 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,...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $27.99
    • (0 reviews)
      # mpn4515297067
      Mercury Marquis 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,...
      Precise manufacturing and high-grade materialsExceptional performance at a competitive price
      $37.99
    • (0 reviews)
      # 1016987970
      Mercury Marquis 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)
      # 1037988942
      Mercury Marquis 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)
      # 503407297
      Mercury Marquis 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...
      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)
      # 1029140698
      Mercury Marquis 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)
      # 742181743
      Mercury Marquis 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 Marquis 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 Marquis 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
    • (0 reviews)
      # mpn4517169874
      Mercury Marquis with AMC 20 Series Axle / with Ford 8" Series Axle / with Ford 9" Series Axle 1978, Differential Ring Gear Bolt 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
      $2.47
    • (0 reviews)
      # 742259736
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt 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
      $140.88 - $165.16
    • (0 reviews)
      # mpn4517168270
      Mercury Marquis with 4 Pinion Gear with Ford 9" Series Axle 1978, Rear Differential Carrier by Motive Gear®. Without Internal Kit. All Motive Gear products are engineered for their specific application and manufactured in state of the...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $204.46
    • (0 reviews)
      # 503355113
      Mercury Marquis with Ford 9" Series Axle 1978, Rear Differential Master 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...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $103.45 - $119.01
    • (0 reviews)
      # mpn4517169068
      Mercury Marquis with Ford 9" Series Axle 1978, Rear Differential Pinion Support O-Ring by Motive Gear®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this...
      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
      $3.86
    • (0 reviews)
      # 742424425
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt with Dual Drilled for 1/2" Ring Gear Bolts / with Dual Drilled for 7/16" Ring Gear Bolts 1978, Rear Lightweight Pro Gear Ring and Pinion Gear Set by Motive Gear®. Motive Gear Pro...
      Motive Gear uses the highest quality standards of manufacturingFrom machining and finishing to heat treatment company demand the best
      $341.48 - $561.60
    • (0 reviews)
      # 742325408
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt 1978, Rear Performance 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...
      Central contact patternCNC start to finish
      $203.94 - $718.77
    • (0 reviews)
      # 742316393
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt 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...
      Quiet operationComputer controlled heat treatment
      $193.74 - $245.52
    • (0 reviews)
      # mpn4517170592
      Mercury Marquis with 4 Pinion Gear with Ford 9" Series Axle 1978, Differential Pinion Shaft by Powertrax®. These hardened cross shafts are specifically designed for use with your Powertrax Lock Right locker. Powertrax Grip-Lok,...
      High quality at an affordable priceExpertly made from premium materials
      $30.12
    • (0 reviews)
      # 503623321
      Mercury Marquis with Ford 9" Series Axle 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...
      Comes Fully AssembledDelivers Progressive and Variable Traction
      $453.13 - $525.00
    • (0 reviews)
      # mpn4517170687
      Mercury Marquis with 28 Spline / with 31 Spline with Open Differential with Ford 8" Series Axle / with Ford 9" Series Axle 1978, Lock Right Locker by Powertrax®. Powertrax Lock-Right performance lockers’ straight-line performance is...
      Brute force devices for rugged applicationsReplacement of differential case not required
      $301.08
    • (0 reviews)
      # 742273433
      Mercury Marquis with Open Differential with Ford 9" Series Axle 1978, No-Slip Traction System by Powertrax®. For vehicles that are driven daily, the Powertrax No-Slip Traction System is the latest design in quiet traction-adding...
      Extreme Traction PerformanceEnables a 2 Wheel Drive to outperform a 4 Wheel Drive in poor traction conditions
      $450.54
    • (0 reviews)
      # mpn4517168992
      Mercury Marquis with 31 Spline with Ford 9" Series Axle with 3.06" Caps 1978, Open Grip LS Traction System by Powertrax®. The Powertrax Grip LS, is a clutch-type differential in a forged steel case. This differential uses a set of...
      Comes Fully AssembledCarbon Fiber and Steel Friction Plate Technology
      $389.00
    • (0 reviews)
      # 503335086
      Mercury Marquis with Ford 9" Series Axle 1978, Open Grip Lok Traction System by Powertrax®. If you are looking for the ultimate in traction, the Powertrax Grip Lok can handle the torque of engines producing up to 550hp. It combines the...
      Comes Fully AssembledTraction Adding Differential Technology
      $515.54 - $563.35
    • (0 reviews)
      # 503587240
      Mercury Marquis 1978, Differential Bearing Kit by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential component that delivers...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $123.74 - $143.93
    • (0 reviews)
      # 1029220621
      Mercury Marquis 1978, Differential Gear Installation Kit by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this premium differential gear...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $33.48 - $34.78
    • (0 reviews)
      # mpn4517168561
      Mercury Marquis with 2 Pinion Gear with Ford 9" Series Axle 1978, Differential Pinion Shaft by Richmond®. Dominate the track or hit the trails with confidence by fine tuning your vehicle for neck-breaking speed and performance with this...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $15.75
    • (0 reviews)
      # 1028991575
      Mercury Marquis with Ford 9" Series Axle 1978, Excel™ Rear Differential Bearing Kit by Richmond®. Designed utilizing the latest technology, this product by Richmond features premium quality and will perform better than advertised....
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $70.92 - $99.41
    • (0 reviews)
      # mpn4517170426
      Mercury Marquis with 4 Pinion Design with Ford 9" Series Axle Empty Case Housing 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
      $230.84
    • (0 reviews)
      # 1028954011
      Mercury Marquis with Ford 9" Series Axle 1978, Excel™ Rear 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....
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $164.95
    • (0 reviews)
      # 503367189
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt 1978, Rear 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...
      Outstanding design and state of the art manufacturing techniquesExtensive testing ensures uncompromising reliability
      $359.45 - $483.61
    • (0 reviews)
      # 742364438
      Mercury Marquis with Ford 9" Series Axle with 10 Bolt 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
      $214.67 - $447.59
    • (0 reviews)
      # mpn4517170775
      Mercury Marquis with 31 Spline with Ford 9" Series Axle 1978, Rear Differential Master Overhaul Kit by Spicer®. Genuine Spicer overhaul kit include all the latest production upgrades, so the parts you’re installing are as good or...
      Save Money: Buying components separately can be costly and cumbersomeSave Downtime: Be ready to perform a repair or overhaul as you need it
      $185.57
    • (0 reviews)
      # mpn4517170278
      Mercury Marquis with 31 Spline with Ford 9" Series Axle 1978, Rear Differential Standard Bearing Kit by Spicer®. Remember - not all bearings are created equal. Choose Spicer axle bearing kits for just the right repair. Each kit comes...
      Highest quality mix of bearings, cups, and cones for performance you can count onPremium oil seals to keep lube in and dust and road grime out
      $134.90
    • (0 reviews)
      # 503495051
      Mercury Marquis with 3.250" Carrier Bore 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 Spicer parts designed to...
      Expertly crafted from premium materialsDesigned to match rigorous quality standards
      $276.00 - $316.26
    • (0 reviews)
      # 1029345504
      Mercury Marquis 1978, Pro Series™ Air Activated Differential Locker by TJM 4x4®. An innovative air locker, the Pro Locker effectively locks "traction-less" wheels and subsequently, the other wheels work harder to get you out. The Pro...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $940.50
    • (0 reviews)
      # 503442338
      Housing End T-Bolt by 9-Plus®. Designed utilizing the latest technology, this product by 9-Plus features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...
      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
      $1.95 - $162.83




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