Bad Vibration

onetoncj7 · Aug 29, 2014

I have a 1998 jeep tj 4.0 5 speed it has 4" lift and a spacer with 35" tires it has a bad vibration in 2 nd and 3rd gear about 30 to 40 mph and if you let off the gas it will stop but soon as you give it gas it's right back i don't know what it is but it will shake the crap out of the dash I have replaced all u joints and rear drive shaft ltanking it was that and it is not any help I will try it out it is so bad you can't see any thing out of the rear view mirror thanks matt

highrolrcustoms · Aug 29, 2014

Does transfer case have a Slip Yoke Eliminator installed?

xjkrawler · Aug 29, 2014

id say you need a slipyoke eliminator based on the transfercase drop bracket that you have.

also could be pinion bearing or rear pinion angle.

rpf500 · Aug 29, 2014

Can you take some pics of the driveshaft and of the rear pinion angle?

TheViking · Sep 6, 2014

What about the angle on the pitman arm? Did it start after you lifted it?

clemsonjeep · Sep 6, 2014

4 inches is usually the most you can go with the tcase drop so to have the 4 plus a spacer id say your rear dshaft isnt happy. Not bad joints...but bad angles. What kind of lower control arms do you have installed?

John Galbreath Jr. · Sep 6, 2014

On re-install, did you clock the driveshaft properly?

CCOR · Sep 8, 2014

We've installed countless 4" kits on TJ's. Your going to want an SYE kit, CV Drive shaft and a set of Upper Adjustable control arms so you can dial that pinion angle in where it needs to be on the rear.
Good Luck,
Bobby
CCOR