Henrey, I got that info off Trucks, they were building copperhead, the 1967 Chevy c10 powered by 572 620 horse street engine Stacey said it would be nice for a 700r4 overdrive but the trans woulden't take it because they were weak, they put an overdrive unit on a 400. I'd trust you first though, seems as though sometimes, shows like that want you to buy the billion dollar peices they use on the show and they say the lower dollar peices won't work when, often they will.