[zjBRYCE]

I recently Put on my 4" RC lift on my 98 ZJ Laredo. Everything went smoothly putting the lift on. However upon first drive of GC after lift was put on i noticed lots of vibration. After lots of research online and talking to people it was discovered that it was mostly coming from the front driveline. For now i have the front driveline of and most of the vibrations have gone away except for a little bit in the rear which i presume is the rear driveline. I checked the U joints and they were fine, looked fairly new. I have considered having the driveline Balanced, perhaps it got twisted or bent after lift or it was not noticable before the lift. I did realize after i put the lift on that it did not come with adjustable upper control arms in the front but did in the rear. Do i need to get Adjustable Upper control arms to better my front dif. angle? Is this the reason i have vibration? Also should i look into a SYE i would like one anyway but i would like to get rid of this vibration ASAP. Im a newbie i have only owned my jeep for a few months and am learning as much as possible.
Any help would be great!

[Jones]

I think the RC kit comes with a transfer case drop, correct? Try taking that out and see what it does. At 4" that part is not needed. Upper adjustable control arms would be a good idea as well. You may also want to consider front and rear adjustable track bars.

[zjBRYCE]

It actually did not come with a transfer case drop bracket. It is still at its stock position. So is purchasing adjustable upper control going to fix it? I have looked around and it should be fine without the drop bracket. So one more thing i didnt consider before is that i might need my driveline lengthened.

[Jones]

I have a feeling your pinion angles are off. Upper adjustable control arms would solve it.

[sadass]

read Yardmans pinion angle post I just responded to, that may help, same problem.