63-79 Cl Corvette 2.73-3.90 Dura Grip Limited Slip 17 Spline Composite Clutches Ci Vett 17 Spline 2.73-3.90 Duragrip Positraction Composite Clutch Yukon Gear & Axle63 79 Cl Corvette 2. 73 3. 90 Yukon Dura Grip Limited Slip, 17 Spline. Positraction Composite Clutches 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. Dura Grips are constructed with a high strength nodular case, forged 4320 chromoly
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