Looking well into the future but have a rear diff question. Originality or functionality? The rear diff in there now is a 3.23 from and Oldsmobile. Awhile ago I picked up a 1970 gto 9799202 xk diff with the 3.90’s in it. The car originally came with 3.90’s so thought I’d try them. Have only drove the car with 3.23’s and even with them cruising down the hiway the rpms seem quite high! Recently found a 1969 9795084 Xh diff with 3.55’s would that be a better option for cursing and originality? Or keep looking for the correct diff?
Also would this just be a casting flaw?
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