I had a near stock 904 in my Duster and in my Scamp. Duster weighed 3000 and the Scamp weighed 2700. Went from a 340 to a 360 and then to a 408. Et's from 10.40 to 9.60 off a trans brake. The only problem I ever had was cracking the converter hub. Switched to the A500/42RH style hub with the flat drive hub and never had another problem. Not sure why you guys think they won't hold up.
Creeping up on 100 trans brake low 9 sec passes with an incredibly stock component 904. Only real “jewel-ray” in the build is the A&A front drum spring pack
. Also went the A500 pump gear
