TH400 Gear Ratios For several years ... the valvebody gets inspected and installed with a shift improving kit at TCI before it’s tested on a special valvebody dyno at their headquarters in ...

Over the last couple years, I have been nursing a well-ridden TH400 transmission in a ’74 ... 2,600-4,500 rpm stall Transgo reprogramming shift kit with Shift Command Transgo reprogramming ...

Its main competitors in the days of classic muscle cars were GM's heavy-duty TH400 and Chrysler's A727 TorqueFlite. "Shift-improvement kits are kind of generic, but I've always had good luck with ...

Its main competitors in the days of classic muscle cars were GM's heavy-duty TH400 and Chrysler's A727 TorqueFlite. "Shift-improvement kits are kind of generic, but I've always had good luck with ...