B&M Tork Master 3000 Torque Converter, 1965-91 GM TH400, 1968-81 TH350The Tork Master 3000 fits 1965 91 GM TH400, 425, 375 and 1968 81 GM TH350, 375B (not 350C) transmissions. Don't let the exceptional value fool you into thinking Tork Master Converters are not packed with lots of quality features, making them the best value priced street performance converters money can buy. These converters perform best when paired with stock to modified engines up to 350hp 350 ft lbs of torque, and lighter weight applications, like