Tremec TUET11012 T-56 Magnum Performance Transmission — Wide Ratio (GM LS Engines)

The wide-ratio version of the legendary Tremec T-56 Magnum. Perfect for LS-powered street cars, cruisers, and high-horsepower builds needing massive torque capacity with relaxed highway RPM.

Features:

• Rated for 700 lb-ft torque
• Wide-ratio gear set (2.97 / 2.10 / 1.46 / 1.00 / 0.74 / 0.50)
• 26-spline input, 31-spline output
• Multiple shift stub locations
• Single-rail shifter design
• Mechanical OR electronic speedometer compatible
• Reverse light switch + reverse lockout built in
• 3-piece synchronizer assemblies
• Optional Stage 2 upgrade available
• Factory Tremec & Bowler 1-year warranty

Fitment:

• GM LS engines (LS1, LS2, LS3, LS6, LS7, LSX)
• Works with GM Magnum bellhousings
• Compatible with standard LS clutch systems
• Console fitment possible using relocation kits
• Not a direct bolt-in for OE 4th-gen/5th-gen cars (custom install required)

What’s Included:

• Tremec T-56 Magnum TUET11012 wide-ratio transmission
• 1-year Tremec & Bowler warranty
• Standard shift position (adjustable)
• Optional accessories listed above (fluid, mount, yokes, hydraulics, bellhousing)

Description:
The Tremec T-56 Magnum TUET11012 is the wide-ratio version of Tremec’s most sought-after 6-speed manual transmission. Ideal for GM LS swaps, pro-touring builds, and high-performance street cars, the wide-ratio gearing provides excellent street drivability with deep overdrive for low cruising RPM and improved MPG.

Engineered from the same DNA as the TR-6060 used in supercars like the C6 ZR1 and Viper ACR, the Magnum brings OEM refinement paired with hardcore aftermarket strength. With a 700 lb-ft torque rating, robust synchronizers, and multiple shifter locations, it’s designed for everything from smooth street driving to aggressive performance use.

Bowler offers the optional Stage 2 upgrade, enhancing shifting precision with carbon-hybrid synchros, Vespel pads, upgraded 2nd gear, and a hardened 1–2 hub — perfect for Autocross and Road Race builds.

When shopping, be aware that cheaper “packages” often include off-brand components. Bowler uses only premium parts to give you the reliability, shifting feel, and longevity you expect from a premium drivetrain conversion.

Gear Ratios:
1st: 2.97
2nd: 2.10
3rd: 1.46
4th: 1.00
5th: 0.74
6th: 0.50

TUET11012

Instructions

Tremec TKO & T-56 Installation Instructions