Quadra-Trac II
Quadra-Trac II was introduced in 1999 and it employs a two-speed chain-driven transfer case featuring three modes of operation, "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions. If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor and causes the clutch pack to progressively transfer torque to the front axle until both axles return to the same speed. "N" or neutral mode is intended for towing the vehicle. In "4-Lo", the front and rear axles are locked together through a 2.72 gear reduction ratio. In 2005 Jeep added its Brake Traction Control System and replaced the New Venture Gear NV247 transfer case with the NV245 transfer case.
Applications:
- 1999–Present Jeep Grand Cherokee
- 2006-2009 Jeep Commander
Read more about this topic: Jeep Four-wheel-drive Systems