So much as been done and now its time to do the drive line. Do I really need a long slip yoke for the rear, say 6+ inches ? It’s gonna be HD for sure with new u joints and everything. rig has dual case with new axles, locker, gears front and rear...

 

no, you don't need a long slip for the rear..just up front

 

X2, yes, stock length slip works fine in back.

Why? Because the rear axle sort of pivots around the transfer case output as the suspension cycles. When it compresses, it moves up and back and when it droops, if goes down but forward as well. So you only get an inch or two of length change (linked or leaf sprung make little difference).

Up front with leaf springs, it is the opposite, the front axle moves up and back (towards the t-case) and down and away from the t-case, so you need a much longer slip yoke.

 

Yes already picked up the TG long spline slip yoke setup... I guess i was told wrong from a local guy here in town... But i guess 4crawler is always on the money and paints the pictures perfectly to make sense...thanks fellow crawlers.

 

Doesn't hurt to tun a longer slip. I think my rear shaft was built with a longer than stock long slip joint. It was something off the shelf and works will. Having more splines engaged will give a tighter fit generally.