For 10" Ford 35-spline pro gears, with both Timken® tapered bearing1. Requires MW yoke or coupler. Drilled for 7/16" studs to accommidate studs used in all MW cases.  All pinion supports come pre-assembled. The bearing pre-load is set through the use of a solid hardened pre-load spacer rather than a crush sleeve or stack of thin shims. The spacer is factory machined to the required preload for each assembly.