Yukon's helical-gear type positraction maximizes wheel traction and enhances driving and handling characteristics. The helical gear type positraction operates as a standard or open differential under normal driving conditions, allowing one wheel to spin faster or slower as necessary. When a wheel encounters a loss of traction or the terrain changes, the gear separation forces take effect and transfer torque to the high-traction wheel. The helical-shaped gears mesh with increasing force until wheel spin is slowed or completely stopped. When the vehicle exits the low traction situation, the differential resumes normal operation. Operation of the limited slip helical gear positraction is smooth, quiet and automatic. The unit will engage without any driver knowledge or action required.