B&M 20228 Transpak HWW8U_FQ653

Product details:

Fits 1965 to 1987 GM Turbo-Hydramatic 400 and Turbo-Hydramatic 375 automatic transmissions. The next step up from the Shift Improver Kit is the Transpak. It has all the features in the Shift Improver Kit plus it provides additional driver manual control (GM TH400, 350, Ford C6 & Chrysler Torqueflite only). Most stock automatic transmissions won't downshift into low gear above 15 mph, and automatically upshift at a predetermined speed no matter what gear you're in. With the Transpak, you can downshift at any speed, and you can hold the transmission in first gear to any speed that you want! This is an asset when you've got a modified engine, and you want additional RPM's, or you're towing a trailer or driving heavy loads downhill. Recalibrate your automatic transmission for optimum performance. Select the mode that best suits your application. Improves transmission life. Transmission removal is not required. Stage 1 Heavy Duty is for Street Rods, normal passenger vehicles or other Heavy Duty use. Firmer shift feel but not harsh. Improves transmission performance and life dramatically without loss of comfort. Retains normal automatic operation when in Drive. Stage 2 Hi Performance Street is for full performance street use. Essentially the same as Heavy Duty mode except each shift is much quicker. Retains full automatic features and standard shift points with selector is in Drive.