Well, I wasn't planning to rebuild these for money, it was more of for my self and a hobby. If my car or truck needs to be fixed I will diagnois whats wrong with it, and find out how to repair it the right way. I try to avoid taking it the garage at all cost of course. So in the same case for my old trucks, I would like to repair, and or rebuild these old transmissions and was wondering how hard or easy it is. Thanks for the info on the top loaded vs side loaded. It seems to be where the parts are inserted. Also im finding that heavy duty transmissions almost always use 50 weight to 90 weight gear oil where as the light duty transmissions built with lighter bearings and parts, higher gear ratios, etc seem to use atf, 10w30 etc. This is some good information on motive gear. Does anyone rebuild these transmissions themselves?