FOR SALE, 2020-5-28 · Muncie M22 4-speed rock crusher with all current upgrades. Three heavy duty Diffs, all in different ratio's. Koni double adjustable shocks. 9"x15-1/2" wheels with original J56 brake system with cooling. MANY spares included. The car ran regularly in the top five for a group of 40 to 50 racers in A&B Production and A-Sedan. Was vintage raced ...Using a Super T, · Using a Super T-10 4spd behind a GM?? Engine & Drivetrain. The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: Using a Super T-10 4spd behind a GM??.