7 1/4 Differential Sure-Grip 1965

65_Dart_GT said

Thanks Charrlie I'll keep looking. There is quite a thunk when I engage to drive or reverse and I am guessing there is a lot of lash in the rear.

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Is there any reason you need to keep the 7 1/4? There are other options, for rears, that are easier to get parts for. Also as stated, the rear might or might not be the problem. Find out for sure, first.