I got the rear all apart and found a messed up axle retaining pin, and a spider gear that was kind of stuck, but no big reason for the vibration. In talking to the guy that put in the 3.73's, he told me about a condition that could warp the ring gear. low fluid level,.. or a leaky axle seal..... DOH!! any of you ever hear of a warped ring gear? Let me know.
Nate
Nate