you are looking for a 400 trans? if so you will need the supper sprag this is made by coan and that is what i would use . this supper sprag i have in my gto after breaking the heavy duty type. this was about $800. for it .so a trans that will take 1000 hp will cost a bit . vasco jet input shaft and front drum.supper sprag. rev valve body .and a stall with a steel stator