I was playing with my 1963 Starfire the other day when a very good friend of mine, who is also a cracker jack mechanic, looked under my car and said "your Olds has a Ford Rear End!" He told me that the bolts on my differential are in the front of the differential like Fords and that GM's are bolted from the rear. I have often wondered if something like this was the case as my car seemed to run at a higher RPM on the highway than other Olds cars of similar vintage (non-slim Jim though). For example, at 80 MPH I'm running about 3500+ RPM's. Does any one have any thoughts or can any one post a picture of a 1963 rear end and differential so I can compare it to mine,please? I know that GM used Ford parts from time to time, so maybe my friend is correct and the rear end in my car is correct too??? Any words of wisdom would be most appreciated by yours truly! Thanks Bob