GM 12 Bolt Car Yukon DuraGrip - 3 Series

*Fits GM 12 bolt passenger car with 30 spline axles *3.08-3.90 ratios only *4-spring, clutch style positraction *Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth *Fully rebuildable *Assembled in the USA The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence and performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction.