Tremec TUET11009 T-56 Magnum – Close Ratio (GM LS Engines)

Tremec’s flagship T-56 Magnum close-ratio 6-speed — the strongest, smoothest-shifting aftermarket manual transmission for GM LS engines. Rated for 700 lb-ft and built for serious performance, street refinement, and modern drivetrain reliability.

Features:

• Rated for 700 lb-ft of torque
• Close-ratio gear set (2.66 / 1.78 / 1.30 / 1.00 / 0.80 / 0.63)
• 26-spline input / 31-spline output
• Multiple shift stub locations
• 3-piece synchronizer assemblies
• Reverse light switch + reverse lockout built in
• Mechanical or electronic speedometer compatible
• Factory Tremec + Bowler Performance 1-year warranty
• Optional Stage 2 upgrade available (Autocross / Road Race)

Fitment:

• GM LS engines (LS1, LS2, LS3, LS6, LS7, LSX)
• Works with GM Magnum bellhousing and common LS clutch setups
• Compatible with many factory and aftermarket consoles using relocation kits
• Not a direct bolt-in for factory 4th-gen/5th-gen cars — custom install required

What’s Included:

• Tremec T-56 Magnum TUET11009 transmission
• Factory 1-year warranty
• Bowler 1-year warranty
• Standard shift stub location (repositionable)
• Optional accessories available above (fluid, mount, slip yoke, hydraulics, etc.)

Description:
The Tremec T-56 Magnum (TUET11009) is the gold standard for aftermarket manual transmissions. Derived from the factory TR-6060 used in icons like the C6 ZR1 Corvette and Viper ACR, the Magnum delivers the refinement of modern OEM engineering with the brute strength needed for high-performance LS builds.

With a close-ratio gear set, stronger synchronizers, a single-rail shift design, multiple shift locations, and a 700 lb-ft torque rating, the Magnum is the “no-compromise” choice for hot rods, pro-touring builds, modern muscle swaps, and high-horsepower street cars. The ability to run mechanical or electronic speedometers, combined with reverse lockout and multiple gearing options, gives builders maximum flexibility.

Bowler Performance also offers a Stage 2 upgrade, which enhances the Magnum for Autocross and Road Race use — adding carbon/hybrid synchro rings, Vespel shift fork pads, an upgraded non-advanced tooth 2nd gear, and a hardened 1–2 synchronizer hub. The result is a transmission that shifts faster, smoother, and more consistently under heavy load.

When comparing Magnum packages, be sure to consider the quality of included parts — many “low price” kits use imported or low-tier components to cut cost. Bowler uses only premium parts, giving you reliability, drivability, and longevity.

Gear Ratios:
1st: 2.66
2nd: 1.78
3rd: 1.30
4th: 1.00
5th: 0.80
6th: 0.63

TUET11009

Instructions

Tremec TKO & T-56 Installation Instructions