Ok guys, I know I am going to get a varried responce from this question, becuase i know that different people do it different ways. However, hears the deal. I have a Rough Country 4 inch full spring lift. I had it profesionaly installed. I beleive the folks who installed it lowered my T-Case and the shimmed the rear accordingly. It rode like a dream. The kit was installed about a year and a half ago. About 6 months ago, My tranny blew up, I took it to another shop (tranny Speacialist) They rebuilt my tranny and reinstalled, however, I think the flipped the spaceres and put the T-case back to factory again. I have had some vibrations and changed my u joints and everything. Couldnt really figure it out. Just yesterday, i realized my T-Case was not dropped anymore... My question is, that i cant remember for sure if they dropped the T-case or not when they did the lift? But I Think they did. So A. Isnt the T-case suppose to be dropped for a 4 inch lift? And B. Would that explain my vibrations? Any help is appreciated. Oh, and one other thing. My dirve shaft is lengthened by 1 inch. Ike Spreading The K5 Gospel!