Out of all the Cummins engine years, I found the 1996 year to be what I wanted. That year for the manual version of the truck had the most hp/tq, a little bit larger stock turbo over the auto, and had intercooling. Sometime during the late 96 year, the went from 12 valve to 24valve. Also for the fuel pump, it responds well to tweeking, and you can run wvo (waste veggy oil) or refined veggy oil through the pump with little to no worrys.
I chose the 12 valve. If you prefer, you can strip the engine of the wiring harness, then add only what you want.. the only problem you will run into is if you use an engine from a manual tranny, and hook that up with the auto tranny. you gain the 15-30 hp/tq with the manual.. but you loose the little device that reads your throttle positioner when using it with the auto. . Im told its easy to make one up. Anyways.. you only need a power wire to the starter and to the fuel injection pump. everything else is optional. oil, water, batt, charge indicators, tach, etc.
After that you have to decide on weather or not you want to go with the hydraulic tranny which uses no electronics, (47RH) ... or go with the other two options which are electronic, the 47RE and the 48RE. If you want to run the electronic trannys, for the extra gearing, and options they allow, you have to get yourself a seperate computer controlled valve body and a stand alone tranny computer. whcih you can program to do just about what ever you want. for an additional 1200 or so on top of the rebuild of the tranny which will be needed.
If you do the swap right the first time.. its not a cheep swap.. but I belive its worth the extra up front, than down the road when somethings gives out.
Id say.. about 2500-3000 for a rebuilt tranny with its stand alone computer, and a better tq converter. and up to 10K for all Billit parts. if your gonna be running over 400-500hp
.. Then you have to decide if you need to upgrade the rest of your drive train... Ohh and dont for get about the Killer Dowel Pin mod... Youll have to look it up for the excact details .. but if it lets go (the dowel pin) so does your engine.
ok so is the hydrolic tranny a standard or..? was there a standard transmission offered for these engines. also you mention better gearing in the electronic trannies, whats the gearing like compared to the standard tranny?