The mud terrains were put on my stock rims, so I have no other tires. I am going to try rotating them and see if the problem changes to the front. The tires make noise at all speeds, but is worse from 50-60. Then it seems to smooth out. Searching the web a lot of people say vibrations from 50-60 is almost always tires. Anybody who has had a driveline vibration, at what speeds did it occur?

99 Sportage 2Dr, 1.5" body lift, 30x9.50 Cooper M/T's, high lift, CB, custom bumpers, Warn manual hubs, Tom Tom GPS, snorkel.
99 Jeep Cherokee 3" lift, 31" mud terrains