Yukon Gear & Axle · New
USA Standard Spool For Ford 9in / 31 Spline
MPN ZP FSF9-31 · Store SKU yukZP FSF9-31
Supplier stock checked 11/7/2026, 6:14:55 PM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
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 spool for Ford 9", 31 spline
Manufacturer fitment & guides
Check ZP FSF9-31 against the manufacturer’s application information below.