How much power will a stock 904 handle

Don, look over on Moparts in the transmission for sale section. There's a guy that sells billet servo's, band struts and stuff. He has some kind of reverse wound accumulator spring that may be what was mentioned above. MrRandyJ is his name and you can't miss all the shiny billet parts in his ads. It seems to be reasonably priced too, for what it is.