Do you have the cv-cv type driveshaft? Replaced mine with one from Carolina Driveshaft, double cardan. It helped a good bit with wheel vibrations. Believe it or not, there was actually a time I was driving back to college going 70-75mph with no vibrations or noises.
99' WJ 4.7, 3.5" lift, Bilsteins, JKS goodies, 32" Guard Dogs on 16x7 4" BS Soft 8s