[686]

Right away Im going to be switching to rears up fron and YJs in the rear.
Im taking 4 YJ springs, 4 and 5 leafs, and building some 6 leafs to run in the back.
Will I experience driveshaft vibrations with this setup? I'll also be going to an inch longer shackle (4" eye to eye).
I already have a Breeze 4.5" Spring over, and driveshaft spacers.

 

[794]

I don't think you'll have vibes if your over all pinion angle stays the same and you don't have any spring wrap problems. When I did 1" lifted YJs I had both problems

Castor shims and a traction bar solved it.