So you might be wondering exactly how a Tremec TR-6060 compares with the T56 you know and love. In short, it's better in just about every way. It can handle more torque thanks to a move from a 10-spline input shaft to a 26-spline unit. Moreover, the new case is stronger, the countershafts are one-piece units, and the gear faces are wider. All these changes add up to much greater strength, which we'll all appreciate after we start modding these cars. What we noticed while driving the car, however, was its easy, precise shifting despite the factory shifter.
The prime movers in the better shifting are increased synchronizers on all the gears. Where the Terminator T56 had only two synchros on the 1-2 and 3-4 shifts and single synchros on the remaining gears, the TR-6060 offers triple synchros on the 1-2 and 3-4, and dual synchros on all remaining gears, including Reverse. Plus, the synchronizers have been upgraded from a carbon-particle paper to a sintered-bronze material.
A larger input shaft, beefier gears, more synchronizers, closer gear ratios, and more make this six-speed one that should become a popular aftermarket upgrade.
So this transmission shifts easier, but it also offers a shorter shift throw. "The synchronizer hubs are much narrower, reducing fore and aft shift travel," Tremec's Jim Averill explained. "Additionally, the hub system uses three encapsulated ball-and-coil-spring struts that are much more precise than the old-style hoop-and-stamped strut. This also adds to a smoother fore, aft shift."
