not in a truck, and not in a pulling application, but....<br><br>600hp/600tq or so (for now) out of a big block (yes, I know I need an adaptor) in a 4200lbs car. Since the car is 2k lbs less than a 4wd, and I'm not towing anything, will a 618 (diesel prepped 518) hold in stock form? anyone know the differences tween a 518 and a 618? valve body or govenor programming for shift points obviously....but what about the hard parts?