Differential Cover Kit, Model 20, Heavy Duty Black Finned Aluminum, 1965-88 AMC, Eagle, Jeep



This AMC Model 20 differential cover features a drain hole, fins and aluminum construction. The fins, aluminum construction and extra capacity dissipate heat. The fins have the traditional straight fin design. This cover also features thick walls and gasket flanges to add strength to the differential housing and to provide a uniform clamping force on the gasket surface for a secure seal. Aluminum is a great material for heat dissipation but not for rock crawling. Cast iron and steel are much stronger and protective.

Because these vehicles receive modifications and reworking, check that this cover will fit the current differential and there is clearance for a larger cover. On some CJs, the gas tank is very close to the stock cover, leaving no room for a heavy-duty aftermarket differential cover.

On the vehicles this cover was designed for there is a magnetic drain plug on the driveshaft side of the differential where filling and level check is done.  


  • Complete kit gives you everything you need to change your differential cover
  • Increased oil capacity .5 quart over stock for cooler temperatures
  • Low-pressure cast aircraft quality aluminum with raised fins
  • Thick wall construction to add strength to the differential housing
  • Thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal using RTV or factory reusable gasket
  • Oil changes without removing the cover
  • Chemically sealed to resist corrosion
  • Complete Kit Includes: 
    • (1) P/N AMC20-BX - Polished Finned Cast Aluminum Model 20 AMC Differential Cover w/Magnetic Drain Plug & Allen Head Differential Cover Bolts
    • (1) P/N 317-3089 - Model 20 AMC Differential Cover Gasket
    • (2) P/N 57904 - Redline Synthetic 75W90 Gear Oil 
    • (1) P/N 80301 - Redline Synthetic Limited Slip Additive
    • (1) P/N AMC8280 - Black RTV Gasket Maker
  • Country Of Origin:  USA
  • Shipping Weight:  25 lbs.
  • Shipping Dimensions:  13"x12"x6"
  • Installation Instructions Using RTV
    AMC, American Motors, Rambler
    Models Years
    Ambassador w/AMC Model 20 Rear End 1965-1974
    AMX w/AMC Model 20 Rear End 1968-1970
    Concord w/AMC Model 20 Rear End 1980-1983
    Eagle w/AMC Model 20 Rear End 1980-1988
    Gremlin w/AMC Model 20 Rear End 1970-1978
    Hornet w/AMC Model 20 Rear End 1970-1977
    Javelin w/AMC Model 20 Rear End 1968-1974
    Javelin AMX w/AMC Model 20 Rear End 1971-1974
    Jeep CJ5 Rear w/AMC Model 20 Rear End 1976-1985
    Jeep CJ7 Rear w/AMC Model 20 Rear End 1976-1985
    Jeep Wagoneer Rear w/AMC Model 20 Rear End 1981-1984
    Matador w/AMC Model 20 Rear End 1971-1978
    Pacer w/AMC Model 20 Rear End 1975-1979
    Spirit w/AMC Model 20 Rear End 1979-1983