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12 RPM Transmissions modifies the Turbo-400 (bottom) to fit the C5/C6 chassis, but the car itself also requires alterations. The tunnel must be clearanced, while the torque tube and driveshaft must be shortened. In this photo, you can see the approximately 3-inch-greater length of the Turbo-400, as compared with a 4L60E. It's also a bit wider and taller.