5 years of "Chrysler TorqueFlite A-904 & A-727 Transmissions: How to Rebuild"

I got my book from A&A this past Indy swap meet.
I just did a 46RE and am about to an a500. I also have the ATSG book on each.
The front section is very much a 727/904 respectively, but it appears that sonnax and superior don't make as much for the 904/500 as I found for the 727 and 518.
Everyone brags about how great 904s are/but I haven't had the best luck with them lasting even in low-po, daily driver cars. So if I build this 500 I want to add some beef up parts to it. This is going in a D150 behind a built up /6.