AMC Model 20 12-Bolt Aluminum Differential Cover Polished w/ Gasket & Hardware

This is a polished aluminum finned differential cover built for AMC Model 20 rear axle housings — the rear end used across a wide range of AMC and Jeep vehicles, including CJ-series Jeeps, AMC Javelin, AMC AMX, AMC Matador, and Jeep J-Series trucks. The AMC Model 20 uses a 12-bolt cover pattern with an 8-bolt ring gear — both specs should be confirmed against your axle before ordering, since the ring gear and cover bolt counts differ and are often referenced independently when cross-shopping covers.

This is a complete kit, including a gasket, mounting hardware, and drain plug — everything needed for a clean installation without sourcing additional parts.

The finned aluminum construction gives this cover two advantages over standard steel covers: reduced weight and improved heat dissipation, helping lower gear oil temperature during sustained use — a meaningful benefit on Jeep trail builds and performance AMC builds where the rear axle sees extended load cycles. A polished finish adds show-quality appearance for builds where underbody aesthetics matter alongside performance.

Verify your specific axle model, housing shape, cover bolt pattern, and suspension clearance before installation.

 

Polished Finned Aluminum Cover Built for the AMC Model 20 Axle
This finned aluminum differential cover is sized and bolted for AMC Model 20 rear axle housings with a 12-bolt cover pattern, giving you a lightweight, heat-dissipating replacement for the factory steel cover on CJ Jeep, AMC muscle car, and Jeep J-Series truck builds — finished in polished aluminum for a clean show-quality appearance.

Fins Dissipate Heat, Aluminum Saves Weight Over Stock Steel
Unlike a flat steel factory cover, the finned aluminum design increases surface area to help dissipate heat from gear oil during sustained use — trail driving, towing, or performance applications where the rear axle sees extended load. Aluminum construction also reduces unsprung weight compared to a steel cover.

COMPATIBLE WITH
AMC MODEL 20 12-BOLT REAR DIFFERENTIALS
• AMC Model 20 rear axle housings
• Factory AMC Model 20 rear differentials
• Jeep AMC Model 20 rear axle housings
• Aftermarket AMC Model 20 axle housings using the factory 12-bolt cover pattern
• Verify housing shape, bolt pattern, sealing rail, and fill configuration before ordering.

COMMON VEHICLE APPLICATIONS
AMC AMX
AMC Javelin
AMC Hornet
AMC Matador
AMC Pacer
AMC Concord
Jeep CJ5
Jeep CJ7
Jeep CJ8 Scrambler
Jeep J10
Jeep Wagoneer

NOTES
• Fits AMC Model 20 12-bolt rear differential housings only.
• Verify axle model, housing shape, bolt pattern, sealing rail, and suspension clearance before installation.
• Confirm fluid capacity and fill level after installation.
• Not compatible with Dana 44, Dana 60, Chrysler 8.25, Chrysler 9.25, Ford 8.8, Ford 9-inch, Ford Sterling, GM Corporate 10-bolt, GM Corporate 12-bolt, or GM 14-bolt differentials.

SPECIFICATIONS
Cover Material: Aluminum
Cover Finish: Polished
Cover Design: Finned
Cover Bolts: 12
Ring Gear Bolts: 8
Filler Plug: Not Included
Drain Plug: Included
Gasket: Included
Hardware: Included