Copyright jalopnik
It was tempting to highlight the Tremec T-56, the transmission Dodge installed to shoulder the brutal torque of Viper V10s. But the TR-6060 is stronger in nearly every way. If you drive a manual Hellcat Dodge Challenger, this is your gearbox. Hellcats make torque like AI tools make bland copy — the car debuted in 2015 with 650 pound-feet of torque when using the Hellcat's full-power red key and 575 pound-feet of torque with the black valet key. Both the TR-6060 and the T-56 Magnum (basically a retrofit version of the TR-6060) are found in cars like the Camaro ZL-1 and can handle up to 700 pound-feet of torque, though there are certain OEM versions of the 6060 that have lower torque ratings. First and second gears in the TR-6060 get triple-cone synchronizers and dual-cone synchros for the other gears. T56s used dual and single cone synchros. The extra cones alone can increase torque capacity, but 6060s also get larger diameter synchros. Plus, the rings changed from carbon fiber to more durable and consistent sintered bronze. Even better, the synchro assemblies are narrower, which leaves room for thicker, stronger gears. The 6060's output shaft is beefier than the T56's, too, and has a one-piece rather than a two-piece countershaft like in T56s. Finally, the TR-6060 did away with the T56's adapter plate to increase case rigidity. Still, 6060s can experience premature bearing failures and develop grinding in first and second gears (and even second gear failure), but this is usually due more to user abuse than any design flaws.
