Originally posted by Sgrinder
Is it better to cut the driveshaft say 3/4' or cut the yoke?
When doing a transmission swap, or a rearend swap for that matter, you must use the proper length driveshaft. The method I was outlining is what I've used for years. Push the front yoke onto the trans output shaft until it bottoms out, then slide it back out 3/4" to 1". The reason for this is to allow some play so that the yoke doesn't bottom out in the trans while driving. The driveshaft is usually installed on a down-angle with the vehicle at rest, so that as the suspension works and the pinion moves up in relation to the trans, the yoke is pushed further into the trans. It is constantly changing the engagement on the output shaft as the suspension works, so you want to leave 3/4-1 inch of play so that the yoke doesn't bottom out. Changing the length of the yoke that slides onto the trans shaft will only change the amount of total spline engagement.