Drum explosion...

Do I have to Drill/Beat this into your Heads? The "Explosions" your hear about in Mopar tranny's come from "running the car" AFTER the "sprag" gets damaged with an improper burnout or mechanical failure. Most don't recognize the failure, And Upon the 2 nd run you'll have tranny parts Scattering all about. The sprag usually fails in 1st gear where all over a sudden you hook on dry ground. Easy way out, Just get em spinning n go to 2nd gear as quick as possible. You'll never have a problem
Now, Here's where it gets tricky... If you run a 904 stock n fresh ...Say 750 HP (Which it will handle) you gotta redo it every round of racing. Say 500 hp into a 904 redo it every year, 400HP and it will last say 5 years.

Anything more than 700 Hp and you'll want the 727 for sure. But Same Rules Apply... RACE it Hard (aka 1000hp +), redo every round .... Race it say 800 HP and your good for a "Season".

Someone add to this I know I left a bunch out but it late here

Eric