Spidertrax 40 Spline Ultimate Unit Bearing 8 on 6-1/2" x 9/16" Studs Side:2 Left and 2 Right Welcome to the next level

Welcome to the next level of Ultra4 braking performance

Easy-to-install shackle mount with a hole machined into the hook’s body

critical for overall shaft longevity

Yukon Grizzly locker for Ford 9" differential with 35 spline axles

This is roughly 2 times lighter than OEM style 60 knuckles

Spidertrax 40 Spline Ultimate Unit Bearing 8 on 6-1/2" x 9/16" Studs Side:2 Left and 2 Right Welcome to the next levelBuilt ground up for Ultra4 rock racers, the Spidertrax Ultimate Unit Bearing is truly the reinvention of the unit bearing itself. Genuine Timken bearings, full chromoly heat treated construction, left & right hand threaded spindle nuts, and a fully integrated drive slug makes the Ultimate Unit Bearing the only racing unit bearing of its kind. The Ultimate Unit Bearing, the last bearing you'll ever need. This Ultimate Unit Bearing uses 9 16" 18 studs