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Does a 2001 F-150 4x4 rear axle have gasket?

The 2001 Ford F-150 4x4 rear axle doesn't have a single, large gasket in the way a motor might have a head gasket. Instead, it uses various seals and gaskets at different points:

* Axle seals: These prevent gear oil from leaking out at the axle shafts. These are seals, not gaskets.

* Differential cover gasket: This gasket seals the differential cover to the differential housing. This is the most likely "gasket" you're thinking about.

So, while there isn't one large gasket, a differential cover gasket is definitely present and needs to be replaced if the cover is removed.