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 in place of the spider gears 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 8.5" with 30 spline axles, Installs into a standard open carrier case, Provides 100% traction to both wheels at all times, Not recommended for street driven vehicles, Mini spool for GM 8.5" with 30 spline axles , Differential Spool, Mini-Spool , YP MINSGM8.5-30 , ,30spl,8.5,FRONT,GM,GM8.5-SPOOLM-30,MINI,REAR,SPOOL,YP,, Mini spool for GM 8.5" with 30 spline axles , 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 give 100% power to both tires at all times. These units are not recommended for street-driven vehicles. We recommend full spools for vehicles with large tires or high horsepower. These units come with a one year warranty against manufacturing defects. , 8.5" GM 30spl MINI SPOOL