The Yukon mini spool for GM 7.5-inch with 26-spline axles installs into a standard open carrier, replacing spider gears to deliver full-time lockup and 100% drive to both wheels. This low-cost traction option is aimed at non-street applications where constant traction is desired; Yukon cautions against street use for drivability reasons.
Yukon Gear Mini Spool For GM 7.5in w/ 26 Spline Axles