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Yukon Dura Grip positraction for GM 12 bolt car with 30 spline axles, 3.08 to 3.90 ratio 4-spring, clutch style positraction 3.08-3.90 ratios only Assembled in the USA Fits GM 12 bolt passenger car with 30 spline axles Fully rebuildable Internal gears are manufactured using forged 4320 steel and cut to provide stronger teeth
