The small front wheel drive cars at GM® like the Cavalier® and Cobalt® have a Getrag F23 manual transmission with a center distance of roughly 3.0"*. Bert designed this transmission for GM. The torque capacity of that unit is 165 ft-lbs. The Tremec (Borg Warner-based) T56 that goes in the Corvette® has a center distance of roughly 3.75" and has a torque capacity of 450 ft-lbs. By increasing the center distance 25% the torque capacity increased 173%. A small increase in center distance yields big increases in torque capacity. All stock Harley® transmissions and aftermarket transmissions have a center distance of 2.5"*. By increasing the center distance 20% to 3.0" the Torquebox conservatively increases the torque capacity to 250 ft-lbs, continuous duty! In the early Torquebox design stages, the goal was set to design a continuous duty 250 ft-lb gearbox that visually looked like a 450ft-lb gearbox on the outside. We achieved this by taking design cues from classic race-bred American superchargers and not having any excess material, anywhere. We achieved our goal. At Biketoberfest 2005, the Torquebox was unveiled and caught the eye of Kendall Johnson. Regarded as the premier performance engine builder in our industry, he called it "…all business!" The Torquebox is available as a 5 or 6-speed, left or right side drive. The 6-speed is identical to the 5-speed except for the addition of two gears and a different drum. The right side drive version is the same as the left except for the mainshaft. All frame, starter, and clutch interfaces are identical to stock 2.5"-based designs. Shift system design innovations and hardware give light, short, precise, crotch rocket type shifts.