Yukon Gear Steel Spool For Ford 9in w/ 40 Spline Axles

Yukon Gear & Axle is known for making tough drivetrain components for performance vehicles. If you're building a dedicated off-road rig or a drag car that needs maximum traction, their Full Spool for the Ford 9-inch rear end is a solid option. This spool replaces your differential carrier assembly entirely, forcing both rear wheels to spin at the same speed, all the time. This means you get 100 percent of your available power to the ground, which is crucial for getting the best launch off the line or powering through tough terrain.

This spool is constructed from 8620 steel, a material chosen for its strength, and then heat-treated to make it even tougher. This ensures it can handle the extreme forces involved in performance driving. It's designed to fit Ford 9-inch rear ends that use 40-spline axles, and it installs directly in place of your stock differential carrier. Because it locks both wheels together, it's not recommended for street-driven vehicles where it can cause tire scrub and make turning difficult. This spool is a popular choice for vehicles like the Ford Bronco, Ford F-100, and Ford Mustang when they're being set up for serious off-road or drag strip duty.