Odd vibration

[summitlt]

I put in new U-joints. Now while driving at certain RPMS (load at 1K, 1.5K and a bit over 2.5K) the truck ahs a odd vibration. It started to vibrate when the Ujoints started to go, then it got worse and worse. I replaced the U joints and it got a lot better but its still there. What else should I look for? Wheels seem fine, no mud packed or anything.

1990 MJ with 2" of lift (lift is old)

[fizassist]

many,many,many,many possibilities. Any bushings, tie rod end joints, tires out of round, alignment, ball joints.... Search for "death wobble" to see likely culprits for any vibration.

[reliablestv]

if you have a SYE then you have a slip yoke in your drive shaft, it does have to be in time

[Jess]

Transmission mount????