I prefer the A500 style pump gear. Still hear about cracked converter drive hubs today.
904>727…. Simple mopar math.
Run the stock front drum…. Much smaller mass that 727. It’ll be fine.
Strut on the kick down band…. They can flex or bend in stock form. Even welding a bolt on the back of it will suffice.
We run the A&A front clutch spring packs, but AARCUDA ran that reverse wound spring in at least two of his transmissions and they worked fine (mid to low 10 cars). Think they’re like $25.
Our amazingly stock component 904 lived for over 100 low 9 passes off the transbrake. Personally I had concerns about the input/output shafts, but they did just fine. Current 904 is an Andrews Racing Transmission unit with A&A goodies throughout. Provides a lot more confidence for us.
View attachment 1716479083