Just lifted my AW4 ZJ 3.5" and I am getting vibration from the front end when I put it in gear and when I drive. I know its not suspention because if I put it in neutral it dosnt vibrate, only when its in gear. I droped my T-case about two inches with spacers and had it aligned and still the problem exists. Any ideas ?

 

Do you have the CV style front drive-shaft? If so, you need to adjust the length at the locknut as per the manual. It's probably vibrating because it's about to separate at the CV. IMO
If you have the u-joint type drive-shaft, check the u-joints for lubrication or wear, and grease the slip-yoke dust cap in the shaft. JMO
Dan

 

mine is the same way, I drove it a little without dropping the case and oh man bad vibe. i then lowered the case with the supplied pucks from RC and its better but not gone. I have the double cardon front shaft with new u-joints. I have a vibration all the time since the front shaft is always spinning, but it does feel like the front I can feel it on my side when driving.

 

Have you gotten it aligned ? I did and it helped a little but its still there and gets worse/better depending on driving conditions. Hopefully we can figure out how to fix it. Im taking mine back to the alignment shop then gonna go from there. Does your vibrate when it is in park or neutral to or only when its in gear ? Did the new shaft or u-joints help or was it a waste.

 

I think I have a bad motor mount or maybe a trans mount causing my idle vibration, and yes it was aligned to get the axle straight. I needed to buy a offset balljoint and a adjusting sleeve. I bought the Jeep with a blown engine and I went thru most of it prior to driving it replacing some bad parts.