I have to take a slip yoke off a driveshaft that I know is not the correct one. (The driveshaft is about a foot and a half too long but it has a 904 slip yoke). I don't have a slip yoke loose on a shelf or anything.
If you measure like I described, make sure the weight is on the wheels. It's ok to put the rear on jack stands, as long as they are under the rear end housing.
