This is somewhat related to another current thread but I'm willing to go a few different routes depending on the advice I get. I have a '72 D200 pickup currently with a 360 and 727 (2wd). I recently picked up a 440 core which I plan to rebuild and swap into the truck. I also picked up a big block 727 which I was told is a 1966 transmission. Now I've heard and seen in some videos (Precision Transmission on YouTube) that the early transmissions have a shorter bushing in the front pump(drum? idk the nomenclature) which should be replaced with the later setup because it is wider and stronger/longer lasting. Would it be worthwhile to swap those parts over from my SB 727 or should I buy the parts separately? It would be a pain because the truck is currently running and driving and I'd rather not pull the trans and have it sitting undriveable for months while I build the BB transmission. What would you guys recommend?