Re: Do i have to resize my tailshaft
Would an FMX 31 spline yoke fit the C6? I do know they are the same size as a 31 spline toploader yoke. If that were the case it wouldn't be that hard to locate one, pleanty of ZJ V8 fairlanes running around with FMX boxes.
He may be alright with the uni joints depending on what the 9" came out of. When i instaled my 9" years ago in the XB, the standard uni joints fitted to the diff yoke fine. The diff was from a ZH fairlane with 302 + C4, it used the flat stap type uni joint retainers with bolts, instead of the U bolt type retainers with the nuts on the rear. I think there may have been 2 different size 9" yokes on some of the later X series fords, mine was definitely original and was the standard 6/8 cylinder borgwarner size yoke.