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Dale Amy
September 1, 2009
In the great pecking order of Mustang manual transmissions, six-speed gearboxes such as those factory-installed in ’03-’04 Cobras and current GT500s clearly rule the roost. While most of us had to get by with only five ratios, the New Edge Terminators used Tremec’s familiar T-56 while the Shelbys get the same company’s newer TR-6060, a stronger box that also sees OEM duty in the Dodge Viper, Corvette, Cadillac CTS-V, and other high-torque applications. Great news for the rest of us is that Tremec has finally released the long-awaited T-56 Magnum for the aftermarket-a box which basically combines a beefed-up T-56 case with the added strength of the latest-technology TR-6060 internals.