These F106 spools are machined from 4140 steel, splined, heat treated, and then finish turned on all locating surfaces for maximum precision and durability. Designed for F106 axle applications, these spools provide a fully locked differential solution for high-horsepower street, drag racing, pulling, and off-road builds.

Each spool is available with 19 or 34 spline axle shaft configurations to accommodate different drivetrain setups. Please specify the required spline option when ordering to ensure proper fitment.

This item is proudly designed, engineered, and manufactured in house at IMS.