[SS Tim]

There are a lot of threads on swaps. Couple of things to remember are that any used O/D trans is a core until proven otherwise. If you have a lockup converter trans make sure the lockup is working. KNOW how to adjust the T/V cable before ever trying the trans.. The driveshaft will probably need to be shortened. Finally it needs a good cooler in addition to the radiator liquid to liquid loop.
What engine/trans. was your truck built with and what does it have now?