Yukon Steel Spool for GM 12 Bolt Car with 30 spline axles, 4.10 & up

Yukon Steel Spool for GM 12 Bolt Car with 30 spline axles, 4.10 & up Yukon performance spools are made from the highest quality materials to ensure high strength and long life in performance applications. Yukon Mini Spools are a low-cost traction option for vehicles looking for full-time lockup. The mini spool installs into a standard open carrier and delivers 100% power to both tires at all times. These units are not recommended for street-driven vehicles. Full spools are recommended for vehicles with large tires or high horsepower. •Fits GM 12 bolt passenger car with 30 spline axles •4.10 and up ratio only •Provides 100% traction to both wheels at all times •Not recommended for street driven vehicles