gstaples
Member
I'm swapping out the 318 spec 8 1/4 rear axle for a 8 3/4 unit I picked up a couple of years ago. I've read that the 8 1/4 axle centerline to yoke centerline is 11 7/8 and the 8 3/4 axle centerline to yoke/universal centerline is 12.35". It that enough difference to need a new driveshaft? I'm hoping this will be just a bolt-in and I can reuse the existing driveshaft. The spring perches and drum to drum measurements are correct for the 71 satellite/roadrunner. I'll probably upgrade to a 400/727 combo eventually and upgrade to a sturdier drivehaft at that time but was hoping to do the upgrades a piece at a time.