55P GM 3.73 & Down Dura Grip Limited Slip 17 Spline Composite Clutches 55P GM 17 Spline 3.73& Down Duragrip Positraction Composite Clutch Yukon Gear & AxleYukon 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. Dura Grips are constructed with a high strength nodular case, forged 4320 chromoly spider gears, and composite clutches. For unmatched positraction performance, the Dura Grip is the ultimate
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