AMC Model 20 12-Bolt Fiber Differential Cover Gasket

• Fiber differential cover gasket for AMC Model 20 rear axle housings, 12-bolt cover pattern

• AMC Model 20 uses a 12-bolt cover with an 8-bolt ring gear — confirm both specs before ordering

• Fiber construction compresses evenly against the cover sealing rail to prevent gear oil leaks

• Sold individually; no hardware, cover, or drain plug included

This is a fiber differential cover gasket sized and punched for AMC Model 20 rear axle housings with a 12-bolt cover pattern. It's a direct replacement for a leaking, damaged, or missing cover gasket on compatible AMC Model 20 axle applications, providing a reliable fiber seal between the differential cover and the axle housing sealing rail during cover reinstallation, fluid changes, or cover upgrades.

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 cover bolt count and ring gear bolt count differ on this axle and are often referenced independently when cross-shopping gaskets. This axle is commonly found in Jeep CJ-series vehicles, AMC Javelin, AMC AMX, AMC Matador, and Jeep J-Series trucks.

This gasket is sold individually and includes no hardware, cover, or drain plug. If you need a complete installation kit including cover, gasket, and hardware, TSP also offers the AMC Model 20 polished aluminum cover as a complete kit (SP4906KIT). Confirm your axle model and cover bolt pattern before ordering, and clean the cover and housing sealing surfaces thoroughly before installation.

Fiber Gasket Cut for the AMC Model 20's 12-Bolt Cover Pattern
This fiber differential cover gasket is punched to match the 12-bolt cover pattern of AMC Model 20 rear axle housings, giving you a clean, leak-resistant seal between the differential cover and the axle housing sealing rail during cover reinstallation or replacement.

12-Bolt Cover, 8-Bolt Ring Gear 
The AMC Model 20 uses a 12-bolt cover pattern alongside an 8-bolt ring gear — the two counts differ, which can cause confusion when cross-referencing specs. This gasket is built to the AMC Model 20's 12-bolt cover pattern specifically. A worn, crushed, or damaged cover gasket is one of the most common causes of gear oil seepage at the rear axle — this fiber gasket helps restore a consistent seal on AMC and Jeep builds running the Model 20.

What axle does this gasket fit?
This differential cover gasket is designed for AMC Model 20 rear axle housings with a 12-bolt cover pattern, commonly found in Jeep CJ-series vehicles, AMC Javelin, AMX, Matador, and Jeep J-Series trucks.

How many bolts does this gasket use?
This gasket is punched for a 12-bolt cover pattern. The AMC Model 20 also uses an 8-bolt ring gear, so the cover bolt count and ring gear bolt count are different. Verify both specifications before ordering.

Will this fit a Jeep CJ?
Yes. The AMC Model 20 rear axle was commonly used on Jeep CJ-5, CJ-6, CJ-7, and CJ-8 Scrambler models. Verify your specific axle before ordering.

Will this fit a Jeep Wrangler YJ or TJ?
No. Jeep Wrangler YJ and TJ models typically use Dana 35 or Dana 44 rear axles and are not compatible with this AMC Model 20 gasket.

Do I need this gasket if I already purchased the SP4906KIT cover kit?
No. The SP4906KIT already includes a differential cover gasket. This standalone gasket is intended as a replacement or for use with the SP4906 cover-only listing.

Do I need to use RTV with this gasket?
Fiber gaskets can be installed with or without RTV sealant, depending on the condition of the sealing surfaces and your preferred installation method. Always clean both mating surfaces thoroughly before installation.

What's included with this gasket?
This listing includes the fiber differential cover gasket only. Differential cover, mounting hardware, and drain plug are not included.

When would I need to replace my differential cover gasket?
A new gasket is recommended whenever the differential cover is removed for gear oil changes, inspections, repairs, or differential cover replacement to help prevent leaks.

Does this gasket work with aftermarket differential covers?
Yes, provided the aftermarket cover is designed for the AMC Model 20 12-bolt axle and uses the factory sealing surface and bolt pattern.

How do I ensure a proper seal with this gasket?
Thoroughly clean the differential housing and cover sealing surfaces, remove all old gasket material and sealant, position the gasket correctly, and tighten the cover bolts evenly to the manufacturer's specifications.