Yukon Trac-Loc provide aggressive yet smooth traction for a variety of performance street and race cars, trucks, and SUVs. Made to meet or exceed OE specifications, Yukon has engineered these units using Raybestos clutches for long life. Each Trac-Loc is rebuildable to allow you to modify or repair normal wear without the expense of a brand new unit and is constructed with a billet steel left case half for increased strength and to reduce common positraction failures. The Internal gears are constructed of forged 4320 steel and match OE tooth profile. Assembled in the USA.