How much power will a stock 904 handle

volaredon said
Where can this reverse wound spring be found?
I have an a500 here to build, and heavy duty parts are proving to be fewer and farther between on a 904/500 vs a 727/518.
I've never built a race car but I've seen plenty of 904s die behind stone stock 140-150ish hp engines over the years without any form of abuse...id be interested in hop up goodies and tips/ advice myself.

What we have here is a reverse wound direct clutch pack spring for the 904, 998, 999, 500, 42RH, 42RE, 44RH, 44RE Dodge, Plymouth, Chrysler, Jeep, or AMC transmission. The stock spring in the direct clutch drum loses its tension at high RPM and causes the direct clutches to drag in 1st gear. This spring is wound in the opposite direction which eliminates that problem and keeps the clutches from burning up and also helps eliminate 2-3 shift overlap. This spring should be used in any transmission that will see 5500 RPM or more. This is a direct replacement for the stock spring, no other parts or modifications are necessary. These springs have been through a shot peening process that drastically increases cycle life and they are 100% made in the USA. Please ask any questions before purchasing. Check my other listings for billet dual ring accumulators, billet 4.2 and 5.0 levers, HD band struts, 904 billet rear servo kits, billet speedometer hole plugs, and billet 727 front and rear servo kits. Thanks for

REVERSE WOUND DIRECT CLUTCH DRUM SPRING FOR 904 500 42RH 42RE TRANSMISSIONS