Driveshaft shortening question

Whooaaa....

That slip yoke method only works WHEN YOU ARE USING that slip yoke...

If you are having the shaft shortened and you intend on putting the slip yoke on after without it being at the shop i would recommend you send the slip yoke with the shaft, or have them supply the slip yoke for the shaft....
The slip is part of the shaft and should be present when balancing...

If they are supplying the slip yoke, do as you were told...

Measure from the trans seal to center and the output shaft to center (or how much the output shaft is past or before the seal) ...
Which is the FACE of the end yoke on the diff where the strap kit meets the end yoke..


Also i would recommend losing the factory shaft....the factory shafts have dampening tubes inside adding to driveline weight...
In the performance world you do not want that bs in there... nor do you really want the neck down shaft