Drive. Tow. Race. Available now— The first and only 6L80 performance kit for trucks and performance applications. With increased max main line pressure as well as a more aggressive pressure curve, this performance kit includes valve body and pump components calibrated to maintain factory shift feel at light-to-medium throttle with progressively firmer upshifts through WOT. Features Quick, clean, firm shifts with increased holding capacity Maintains factory shift feel at light to medium throttle with progressively firmer upshifts through WOT Produces faster line rise when adding throttle Patent-pending technology reworks the 2-6, 3-5-R and 4-5-6 clutch regulator and boost valves to produce faster and cleaner shifts with increased holding capacity without any bumps, clangs, bangs or software tuning Street show-off options with HPtuners or EFI Live (Must be used in conjunction with #6L80-TOW&PRO) 1-2 & 2-3 hard-throttle tire chirping shifts Simple computer tuning of shift time tables