The T56 manual 6-speed transmission was first built by the Borg-Warner company and made its debut on the 1992 Dodge Viper powertrain, replacing the T5 5-speed transmission as the go-to industry standard for the new decade. The transmission design and process took on the TREMEC name in 1998 while adhering to the same original equipment manufacturer standards required by the Big 3 American vehicle manufacturers in Detroit: Chevrolet, Chrysler, and Ford. Known for its durability and serious muscle car powertrain performance, it was sold as original equipment not just by GM but also installed in the factory in Ford vehicles and Dodge street stock applications. Now it remains a popular and affordable aftermarket transmission for enthusiasts that wish to restore their classic machine.

Why is the T56 still at the top of the list for repair shops and backyard mechanics? Its design is a favorite as many of its components are listed on the Interchange as compatible with a wide range of domestic and foreign vehicles. Its internal parts remained much the same as it rolled off the production line over the years. Better yet, it built a reputation for longevity, often surviving 200,000 miles or longer when properly maintained. Of course, turning out torque numbers up to 550 pound-feet for the Dodge Viper SRT-10 with aftermarket tweaks made it attractive to weekend racers.

As the demand for increased performance grew in Detroit, TREMEC needed to upgrade the T56. The TR-6060 manual 6-speed transmission took its bow on the 2007 Ford Mustang Shelby GT500 and the TR3650 transmission went to the V6 and GT Mustangs. A new synchronizer package reduced shift travel and the effort needed to physically move the gear lever. Larger gears in the roomier housing allowed for greater torque, reduced friction, and precise shifts. TREMEC remains a major supplier and the TR-6060 is still being manufactured as original equipment, featured on the 2022 Cadillac CT4-V Blackwing.

Since demand for the TR-6060 design remains high for aftermarket applications, TREMEC builds the Magnum which it sells to auto parts stores and private entities for restoration and professional performance projects. A T56 Super Magnum can bring up to 700 pound-feet of torque to your luxury performance sports car or be installed in your race car paired with a Chevrolet Performance crate engine. Since so many automakers utilize the TREMEC transmission, the Magnum comes with a true drop-in design.