I have determined that i need a better input shaft and hub, the rest, except for the output shaft, is good parts . To keep it alive with a 580 i figure a short part throttle launch will suffice. Once the car gets moving a foot or two stresses start to drop pretty fast. So maybe leave at 4000, .2 or . 3 at half throttle, it should live and maybe, just maybe i can stick the tires!