cbob - First off Welcome to Stovebolt!
Of critical importance to help folks offer answers is knowing more info on what truck you are working on??? BTW - For most folks these days, the upgrade manual of choice seems to be the T-5 5 speed transmissions from Chevy S-10 and GMC S-15 trucks. They are 5th gear overdrive (OD) units, and depending on which one you find/chose, there are a number of OD final drive ratios to consider.
Lots of extra considerations other than bell housing and mating up to a 292, which many folks have done, in addition to using them behind many other 6 cylinder and V8 engines in our trucks. Come back and give us more details so we can help point you towards the best solutions.
