Rear Diff

SGBARRACUDA said

You can use a 8 1/4 out of a 73-76 A-body. Or some have used 8 1/4 out of Jeep Cherokees to get a disc brake rear end.

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Yes and no about the jeep rear end. They still use the a body rearend but get the rear disc, gears and sure grip unit from the jeep rear.