Yukon Gear Steel Spool For Ford 9in w/ 35 Spline Axles

If you're building a dedicated off-road rig or a drag car, a Yukon Gear & Axle spool is a solid option for converting your Ford 9-inch differential to 100% lockup. This spool replaces your entire differential carrier assembly, ensuring that both rear wheels receive 100% of the available traction at all times. It's designed specifically for Ford 9-inch rears that use 35-spline axles, a common setup in many classic Ford trucks, Broncos, and performance cars like the Mustang.

Yukon makes these spools from strong 8620 steel, then heat-treats them to add even more durability for demanding applications. Because it locks both wheels together, this type of differential is not recommended for street-driven vehicles where it can cause tire scrub and make turning difficult. However, for applications where maximum traction is the only goal, like rock crawling or straight-line racing, a spool is a very effective and cost-efficient solution.