I had planned on going with the book on the transmission, will check on the Sentec. As for the transfer case, im thinking 90w gear oil should be fine, thats what i use in my axles on both the 92 and the 2000, as for the gasket is this something you just do to remove all the old fluid? i did notice on the backside of the T-case i do have some slight seepage from around that cover, but of course most of us know manual trannys and heavy stuff usually seeps a little bit, the gaskets for the T-case where does one aquire those at??