12T GM 3.73 & Up Ratio Dura Grip Limited Slip 33 Spline Positraction W/ Composite Clutches Dura Grip Lsd Posi GM 12T 33 Spline 3.73-Up Ratio W/Comp Clutches 12T GM 33 Spline HD 3.73 & Up Duragrip Positraction Composite Clutch Yukon Gear & Axle12T GM 3. 73 & Up Yukon Dura Grip Limited Slip, Aftermarket 33 Spline, Positraction. Composite Clutches 12 Bolt Truck 45 Degree Pressure Angle on Side Gears Yukon Dura Grip is a positraction limited slip differential that provides smooth yet aggressive traction, giving you the confidence and performance you need across a wide variety of terrains. The Dura Grip is engineered for long life and is completely rebuildable. Yukon Dura Grips are constructed