I took my stock driveshaft, and with a pinion adapter plate from Tom Woods & a bronco yoke, had it redone to eliminate the stock rear CV joint. (old thread here somewhere I did on it).
Worked outstanding for years, and thru the first revision of the TS.
Then when I upgraded my rear 2.5" #400 alcan leaves to 4" #800 leaves, I was getting odd harmonics when the driveshaft became unloaded between coast and load. Not really vibration, but you could hear it. It's a fine line in lift where the standard u-joint shaft no longer runs without vibration.
Had Tom Woods build me a double cardan unit, and no more problem. Too bad they quit making them, but it's good there are other choices out there I'm told.
Now I carry the old one on the roof rack for a spare just in case...
When I do the fronty lift/TS after moab, I'm hoping I can get away with just double joints and no cardan as the driveshaft is much longer and less angle (I hope, 6"DB & TS
).
Guess we'll see....