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Several types of differentials are used in the automotive aftermarket with several different applications. For several different applications, an Eaton Detroit Truetrac limited-slip differential is a good choice. The Eaton Detroit Truetrac has helical gears inside that employ forces to automatically transfer torque to the wheel with the best traction. According to Eaton, the differential is open during normal cruise conditions and as the wheel encounters loss of traction the gear separation force takes effect and transfers torque to the high-traction wheel.