superior shift kit racing th700 th700 r4Superior Shift Kit for TH700 High Performance Designed with the street rodder in mind, this high performance valve body kit provides clean, smooth shifts under normal throttle and firmer, more positive shifts during heavy throttle use. Features: Delivers super positive shifts Includes a Corvette style servo for enhanced performance Stabilizes the 4 3 shift for smoother operation Raises lock up speed for improved drivability Includes: . 471 boost valve