I found me another chevy for a ggod price but says needs tranny rebuilt. But my question is. What is the difference between a 2 by and a 4bys tranny both being 350 trannies. If i got the truck could i just change the tail sections out on the two since i have one for a 2by in my yard or is this not possible. I know very little about auto transmissions. This truck has a 203 w/part time kit. But anyway can i swap tailends of these two trannies or will i have to pay and get someone to rebuild this tranny if i buy this truck?