The Detroit Truetrac was the first gear-type limited-slip differential in the industry. There are no clutches, cones, or maintenance required, and the parallel-axis design planetary helical gears provide quiet, automatic splitting of torque. Power transfer goes literally unnoticed by the driver. The Truetrac performs like an open differential under normal driving conditions and automatically transfers torque to the wheel with better traction when needed. The limited-slip responds instantly to torque feedback, anytime, at any speed. We've found you can get an even more positive lockup by preloading them with the brake when needed.