USA Standard Gear 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.
USA standard mini spool for Ford 9" with 31 spline axles
USA Standard Mini Spool For Ford 9in w/ 31 Spline Axles
,31spl,9,FORD,MINI,SPOOL,ZP,
9" FORD 31spl MINI SPOOL
Differential Spool
ZP MINSF9-31
Mini-Spool