I have a 97 1 ton with 6.5 TD Automatic. (Engine is very good)I also have a 1994 HD 1 ton 5 speed truck with a bad engine!, I have a 2002 duramax engine and Allison trans. Duramax came with exhaust system,fuel tank,NO Coumpter some wiring. I was thinking about putting the Duramax in the 94 1 ton because it has a real nice 12" flatbed , 5 speed has maybe 500 miles on it.The whole truck is in nice shape. Someone told me the injecter pump would have to be swaped out if I put the 6.5 engine from the 97 in the 94 truck? I can part out the 97 for parts to put the Duramax in the 94. I could also put the Dudamax in the 97! Just wondering what kind of Rodeo am I getting myself into? I'm am a good mech and have all the equiptment to do both.. Any sugestions or info would be helpful..Thanks