ok i know its been done and ive see one of them like it. i wanty to put a cummins 5.9L I-6 in my sub. 12 valve (pre 1998) or 24 (1998 up), 12 will be easier and theres more aftermarket parts available for them. i know ill need bigger springs and im getting a D60 ASAP. what about the tranny? can my th400 handle 500+ft/lbs of torque? i dont think the HP will be all that high maybe mid 200s but the torque im afraid will kill my th400. can i beef up my 400 to make it handle it? i know the TC will need to be changed. and how much will this cost including the price of the engine? i was thinkin i can get a wrecked dodge pickup and pull the motor and tranny out of it. would it be hard to swap a dodge 5 speed stick into it? i really want a diesel and the old 6.2s and 6.5s are garbage so this is what i wanna do.