TH375 400 M40 TRANSPAKTH-400, 375 & M40, Recalibrate Your TransmissionPart Number: BM20228 It has all the features in the Shift Improver Kit plus it provides additional driver manual control. 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 RPMs, or you're towing a trailer or driving heavy loads downhill. Recalibrate your automatic transmission for optimum performance & extended life! Select the mode that best suits your application: STAGE 1. HEAVY DUTY; Firm positive shifts without loss of driver comfort for improved performance in all street vehicles. Recommended for regular passenger vehicles. STAGE 2. STREET/STRIP; Provides positive shifts for high formance street use or for competitive events. This level is for the enthusiast who wants the hardest, quickest possible shift. Provides crisp shifts on any stock automatic transmission Eliminates shift overlap & excess wear on clutches & bands due to slippage Application: Buick, Chevrolet, GMC, Olds, Pontiac - '65-'87 TH-400, 375 and M40
