T-56 Magnum Wide-Ratio 6-Speed Manual Transmission

The Tremec TUET11012 T-56 Magnum is a 6-speed manual transmission from Bowler Performance, specifically engineered with a wide-ratio gear set for GM LS engines. This transmission is built to handle significant power, boasting a 700 lb-ft torque rating, making it suitable for high-horsepower street cars, pro-touring builds, and ambitious LS engine swaps. Its wide-ratio gearing provides a balanced driving experience, offering excellent street drivability with a deep overdrive for lower cruising RPM and enhanced fuel efficiency. Drawing from the same advanced design as the TR-6060 found in performance vehicles like the C6 ZR1 and Viper ACR, the T-56 Magnum combines OEM refinement with rugged aftermarket durability. Key features include a 26-spline input shaft, a 31-spline output shaft, multiple shift stub locations for installation flexibility, and a single-rail shifter design. It is compatible with both mechanical and electronic speedometers and includes integrated reverse light switches and reverse lockout mechanisms. The transmission also utilizes robust 3-piece synchronizer assemblies for smooth engagement. For enthusiasts seeking even greater performance and precision, Bowler offers an optional Stage 2 upgrade. This enhancement includes carbon-hybrid synchros, Vespel pads, an upgraded 2nd gear, and a hardened 1–2 hub, making it ideal for demanding applications like autocross and road racing. Fitment is primarily for GM LS engines (LS1, LS2, LS3, LS6, LS7, LSX) and is compatible with standard GM Magnum bellhousings and clutch systems. While console fitment may be achievable with relocation kits, it is important to note that this transmission is not a direct bolt-in for OE 4th-gen and 5th-gen F-body vehicles, requiring a custom installation.