In attempts to solve my vibration issue, I will be removing the rear part of the NP208 tomorrow to replace the bushing and seal. Just wondering how difficult this will be. I am planning to go on a run on Saturday, and hope I can get this done Friday night after work. Anyone ever done this before? How long did it take ya? Is there anything else I should do while I'm at it? I took the Blazer down to the drive train shop and was told that my angles (with t-case lowered) are perfect (6' and 7'). The guy suggested the vibration might be coming from the output bushing in the NP208. He said it was probably toast due to running a stock drive shaft for so long on the lifted truck. I've had the drive shaft lengthened since. Any advice is greatly appreciated, Thomas.