Strengthening The Tremec Magnum Transmission

D&D Performance helps get Mark Stielow’s shift together

- Barry Kluczyk

Offering great strength and performance on the track while also enabling great highway fuel economy, it’s little wonder the TREMEC Magnum six speed transmission is the gearbox of choice for many builders these days. Pro Touring pioneer Mark Stielow has used it exclusively on his last several Camaro projects and is going with it again with his latest build, dubbed Gunner.

Based on the design of the well-regarded T-56 transmission, the Magnum uses the “guts” of the TREMEC TR-6060, with its gearbox found in late-model performance vehicles such as the fifth- and sixth-gen Camaro, C6 Corvette, and Cadillac CTS-V. Simply put, it picks up where the T-56 left off, with elements designed to stand up to the kind of performance generated by, say, the 650hp Camaro ZL1.