500 518 618 TRANS-BRAKE VALVE BODY lock up in 2nd, 3rd and or 4th (overdrive) gear. CRT Billet trans brake with low band apply. Super fast launch with no creeping when apply of the trans brake. High pressure high flow low band apply. Shift pattern P N 1 2 3 4 push button to get reverse. This valve body requires a low reverse billet servo kit.