I'm most interested in the 4JG2 intercooled turbo as used in Troopers and Rodeos through around model year 2000. The other diesel is the 4JX1 intercooled turbo, used in the latest Troopers, but since it's an ECU-controlled common-rail engine there isn't as much "shade-tree" tuning capability. I haven't gotten any solid info on the transmission models these engines use though.