If you use the stock pan on it, you WILL kill it. You MUST use a deep pan, otherwise it runs out of fluid on the 2-3 upshift, and kills the clutches. The 904 is an awesome trans, and I bracket raced them for 7 years. Only had to rebuild it twice in the first two weeks, put a deep pan on it, went the remainder of the 7 years without a single issue....You loose almost 1s in 1/4mile et with a 727 on a mild small block...