Rcrivolio

Recently installed a 2'' lift in my 98 sport. I did rear shackles and replaced my original leaf packs with rugged ridge HD springs. Everything seems to be ok but at low speeds (30mph and below) I get vibrations when I give it some gas.

I replaced my ujoints because I knew they were going bad and might have been the cause of the vibrations but that doesn't seem to have solved anything. My angles seem to be ok. My pinion and trans are parallel.

Any thoughts on fixing this? I would hate to have to put a SYE in for a 2'' lift. Would shims be a good idea to raise the pinion up a little? If so any idea how much?

Tsaani97xj

Im betting you are over 2" of lift. I would try a 2* first. Fat side of shim to the rear. It doesnt take much to cause issues through trial and error Ive found that the thickness if a single heavy duty washer can increase/decrease vibes. This was on a tcase drop.

300EXC

I had the same problem on my 99. I dropped the t-case 1/2 inch and the vibes went away.

mrshaft696

every vehicle i ever lifted or lowered i had this problem, i did less than a 2" lift on my 99 xj, had to drop the t-case a full inch....

macgyver35

Funny... I also have a 98 Sport. I did a 2" lift with Old Man Emu rear leaf springs and Daystar spacers in front. No SYE and no shims or t-case drop. It's been that way for three years and I've never had any vibrations at all.

Rcrivolio

My measurements put me at 2.5 up front and 2 in the back. (That's over what factory should have been. My old leafs were sagging like a mother f*****)

I've heard bad things about dropping the tcase. Not to mention I'd rather not sacrifice the clearance. I guess I'll try shims if no one can see any adverse issues doing this.

Rcrivolio

Not helpful but thanks for the input.

SomeGuy138

Only at 1 1/2in of lift here and had to do a TC drop of 1/2inch to stop vibrations.

Outlaw Star

Every Jeep is different. Some have vibe, some don't. I know, its weird.