Universal Dura Grip Positraction for GM 12 Bolt Car, 30 Spline, 3.73+ (YUKYDGGM12T-4-30-1)Description Dura Grip is a positraction limited slip differential that provides smooth yet aggressive traction across a wide variety of terrains. Engineered for long life, it is completely rebuildable for lasting performance. Features Limited slip positraction differential High strength nodular iron case Forged 4320 chromoly spider gears Composite clutches for smooth engagement Fully rebuildable design For GM 12 bolt car, 30 spline, 3. 73 and
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