I am in the process of transplanting a 440 chrysler engine and a 727 tranny into my m715. I have totally rebuilt the motor and starting to work on the tranny. The problem is i have a 2wd tranny, i need to make it into a 4wd tranny by replacing the tailshaft and housing with a shorter one which would be on a pre 74 4x4 dodge pickup or maybe motorhome. The main problem is i cant find a 4x4 tranny to buy or get parts out of and i was wondering if any of you would know of one?(It is a 3 speed auto)