The Yukon mini spool for Ford 8.8-inch with 31-spline axles installs into a standard open carrier and delivers continuous 100% traction to both wheels by replacing the spider gears. Offered as a low-cost traction option, these spools are intended for full-time lockup applications and are not recommended for regular street-driven vehicles.
Yukon Gear Mini Spool For Ford 8.8in w/ 31 Spline Axles