If the driveshaft length is good,
an option would be to enlarge the lock groove on your PTO shaft to accept the newer style lock collar. If you also use the tractor for mowing duties, you could easily use the newer DuraTrac/GTX style spring lock collar u-joint for the mower deck as well.
Either way I would have to get a different U-joint. What I use for the mower deck is about 8" long vs the 50" driveshaft.
I think what I'll do is change the QC yoke on the drive shaft. I have a spare "Non-repairable" U-joint that I am repairing and another one that need's to be. I'll just swap the heads while I'm replacing the needle bearings.
Edited by Zekkjacen, April 27, 2017 - 01:46 PM.