you need a cummins nv4500----if you have a dodge gas you can swap out the input shaft and bearing retainer maybe $200--amazon sells the kit----if you have a chevy one you cant use the early model--i think it breaks at 1996---the early will not bolt to a cummins bell housing and it has a lower first gear which means if you tried to use it the input shaft/gear is different and you have to totally disassemble the transmission to get to the corresponding gear then it still wont bolt to your cummins bellhousing--------if you get the late chev after 1997 it will bolt to the cummins bell housing and you can swap the input/bearing retainer easy----however the chevy output spline means you have to use a chevy transfer case or a chevy driveshaft....