'75 A model 8.25 worth upgrading or leave as is?

Joe Dart said

Does a later model 8.25 that has the 2.73 carrier fit in the housing that I have.If you say yes,I'm going hunting for one.

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Yes, all 8 1/4 2.73 and higher carriers are interchangable up to 1996(splines changed from 27 to 29) ,also 76 and newer uses larger carrier bearings so if you want use a 76 up carrier you'll have to swap to the smaller bearings.