Hello All. After searching in the thread I still have some questions. So in short, I have a '00 stock xj that I recently put a 3-inch zone full lift kit on. In the back I put RC shackles with the 2 holes and set it at the 1st hole. thus 3 inches in front and 4 in the back with bar pin eliminators. When reading on the forum, people say SYE after 4.5 lift, that is why I chose the 3-inch kit. Somehow I get bad vibrations when driving close to 30+. The u joints are old and so it the trans mount (might be original). What would you guys recommend? Should I replace the u joints and mount then if that doesn't work try shims then if that doesn't work t case drop, and last SYE (most expensive). Or did i miss something when installing the lift and I might have to adjust the angle by loosening the u bolts and reposition? Everything was torqued when car was on the ground except u bolts. Also I did not install the new 31 inch tires or do an alignment on the car yet.

 

I have a 99 and at exactly 3” a Tcase drop worked to eliminate the vibes. For me it was a temporary solution. I was getting a sye, driveshaft, trans mount and engine mounts in the near future along with different lift springs. I did test drive it with 4.5”s in the the rear with the tcase drop to see how it felt. Let’s just say I didn’t drive it anymore until the sye and driveshaft were installed. That was my experience. If you lower the rear down to 3”s you’ll still be ok for 31’s. Do your u joints and trans mounts though. If your engine mounts haven’t been replaced they’re probably in need also.
Think about what’s going on with a tcase drop to your exhaust, engine mounts, trans mount, and tcase linkage. Maybe plan for a sye and driveshaft in the near future.

 

New u-joints, cap retainers, SYE, and an alignment. And transmission mount if you feel yours is original. Do not buy Anchor.