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The USA Standard Spartan Locker for GM 12-bolt cars and trucks with 30-spline axles replaces the spider gears to provide mechanical 100% lockup traction in a lunchbox-style unit. Yukon’s spring-and-pin design simplifies installation without extensive carrier modification, and heat-treated 9310 steel internals improve durability, making this a practical traction upgrade for GM 12-bolt 30-spline applications.
USA Standard Spartan Locker For GM 12 Bolt Car & Truck w/ 30 Spline Axles
