i am building a 496 HYD ROLLER street engine pump gas TQ monster for a drive it any were and fast as you can go .we did some taking about the 4l60e after some talking the guy did want the added gear for hi speed running the $5000+. did slow him down some .so we are going the time tested 400 trans and if he wants more gears we will put a gear vender over drive on the 400 at a later date