4 spd tranny with t case from the 3 spd. Everyone says its a perfect set up for the rocks because you get the lower gears. GREAT except it's a pain in the @#@ to do. My step dad is doing most of the work and I'm helping him. He was a mechanic for years and just swapped tranny's in his cj 7. Those of you who were at cullowhee met him. He was the one got the lexus running again. Any way, I bought the adapter kit from JT Outfitters and will never buy anything from them again.(this was before John told me how they treated him) My transfer had the PTO gear so there was a big space to fill once the adapter gear was in place. Call to JT: They tell me it was rare to have this gear and the kit doesn't include the spacer and most people reuse the spacer in their transfer case. This helps me none. As for getting the spacer he tells me to get on line and start searching. @#$#@@#$% So I take the PTO gear to a local machine shop(Tassin &Tassin in north Charleston 843-747-0977) where Kenneth Tassin whips out a spacer to replace the pto gear overnight.