Installing a quality USA Standard Gear spool is a cost-effective way to get 100% lockup. Installation is easy as they install in place of your differential carrier assembly. Each USA Standard Gear spool is made from high-quality 8620 steel and heat treated for additional strength. A spool is an outstanding choice for dedicated off-road and drag racing vehicles only.
USA standard steel spool for Dana 44 with 30 spline axles, 3.92 & up
USA Standard Steel Spool For Dana 44 w/ 30 Spline Axles / 3.92+
,&,3.92,30spl,D44,SPOOL,STEEL,UP,ZP,
D44 3.92 & UP 30spl SPOOL, STEEL
Differential Spool
ZP FSD44-4-30UP
Spool