TREMEC T56 Magnum-F TUET16363 (Wide Ratio) for GM applications. They can withstand up to 700 ft.-lbs. of torque, with gears featuring substantially increased face widths and 2-piece laser-beam welded construction, allowing for greater control of the tooth angles, pitch, and alignment. 

This is the T56 Magnum-F 6 Speed for GM applications, 700ft-lb constant load rated, unmodified, 26-spline input shaft, 4616 chromoly gears and shafts, one-piece counter shaft, triple cone synchros, new in box, full factory warranty from TREMEC. The T56 Magnum weighs 65kgs. This transmission is not to be confused with the TR-6060 in factory / OEM configurations.

Additional benefits include:

* Bolstered one-piece countershaft to resist distortion
* Stronger input shaft
* New synchronizers featuring fine tooth angles
* Redesigned shift forks
* An extensively modified transmission case to prevent leaks under high-stress conditions and increase overall power-handling capabilities 

Close ratio: 2.97, 2.10, 1.46, 1:1, .80, .62