The Powertrax Grip Pro is a gear driven limited slip differential in a machined, forged steel case. Designed to be among the strongest and most durable in the industry. The Powertrax Grip Pro delivers progressive and variable traction based off of throttle input. On the road, and on the track, Grip Pro is a winner! Powertrax Grip-Lok, Lock-Right Lockers and No-Slip Traction Systems automatically provide 100% traction on-demand, under the toughest circumstances. The Powertrax Grip-Pro and Grip-LS performance limited slips offer smooth dependable torque transfer and traction for the best of both worlds!