904 vs 727?

It's the drum that explodes. They are bigger in a 727 and stress is more further out. Sprag can go bad in either one when you break a R&P or u-joint on launch or screw up your burnout. In 40+ years I never seen a 904 explode like a 727, including in my race cars. Chrysler tested 904 vs 727 in the '70 in Stock & SS cars. 904 was faster by .15, all else being equal. Low gear in later 904's is nice in certain applications.