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AMC Dana Spicer Model 20, 12 Bolt Differential Cover

Part Number 5048 (Was Part Number 9760)

PML Spicer 20 Differential Cover, As-Cast PML Spicer 20 Differential Cover, Black PML Spicer 20 Differential Cover, Polished
As-cast finish
$195.00 Go To Cart
Black powder coating

$245.00 BuyNow
Polished finish

$310.00 BuyNow

Volume: 0.5 qts over stock

Dimensions: Click here for dimensions. A separate window or tab will.

This AMC Model 20 differential cover fits vehicles:

  • Jeep CJ 5 rear, 1976 to 1985
  • Jeep CJ 7 rear, 1976 to 1985
  • Jeep Truck rear, 1981 to 1984
  • Jeep Wagoneer rear, 1981 to 1984
  • Muscle cars such as the 1968 AMC AMX-R

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 PML covers 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 plug on the driveshaft side of the differential where filling and level check is done.

H1 Hummers have front and rear differential covers very similar to this. We are making new covers, modified for the H1. We are adding a fill hole and modifying the bolt hole pattern. Prototype parts will be ready October 2016. If you have an H1 and are interested, please let us know by calling 310-671-4345 or emailing

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 5048 height compared to stock  PML Differential Cover Part Number 5048, compared to stock
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These images show this PML differential cover compared to the stock cover.

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PML Differential Cover Features:

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • Thick wall construction to add strength to 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
  • All hardware provided, including magnetic drain plug

Learn more about finishes and construction of PML parts.