Hey guys i have a question and need help, i hav a 96 cherokee with a 4 inch lift and whn i drive down the road i get bad vibes i think from the driveshafts i heard somewhere i needed shims to fix the rear axle angle. Is this the problem and if so wat do i get for shims i looked them up and saw a 4 degree shim and i think ill need that but any info is greatly appreciated thanks. ps if i posted this in the wrong spot i am sorry

 

Shimming your rear axle may help some of the vibs from the rear Ujoint.

The front U joint will cause vibs too if it's not in line with the drive shaft and slip yolk.

Options are; dropped Tcase, raised motor mounts, or a double cardan front joint on the rear shaft.

 

ive done the t case drop im looking into motor mounts since mine are crraaappp lol and i have double carden joints on both my front and rear driveshaft but thanks do u know what degree shim i should use?

 

You need to put a strait edge on your rear yolk and determin how far it needs to move to be inline with the drive shaft when the jeep is sitting on the ground.
I think tomwoods web sight has info on checking this.

 

You probably need an SYE.

 

X2

 

X3 it's the only "right" way to eliminate the vibes, plus this way you don't Lose ground clearance

 

wat does a sye actually do i know its a longer shaft than the original but im still not sure wat it does and i ordered the 4 degree shim to for the rear but the sye sounds resonable but i dont hav 3 hundred to spend right now :/

 

Pic from http://www.4xshaft.com/ TomWoodsDriveshafts.


The SYE it's self doesn't solve the vibration problem, the double cardan joint does.

a SYE is a good strong way to install a double cardan joint and a longer drive shaft, but the above shaft will eliminate vibes from the upper joint. It costs less, but you also get a shorter shaft. (But this isn't a TJ with the mini shaft)

And the double cardan solves upper joint vibes, but doesn't solve lower joint alignment which can also cause vibes.

 

How old are your U Joints?

 

So this shaft will get rid of vibes without an SYE?

 

joints are all maybe 3 months old and i have double carden joints on both driveshafts and they both are cv driveshafts i hav yet to see anyone else like it ??? its weird but yA