Original Factory gear for Ford 10.25" in a 3.31 ratio. OEM gears are recommended for quiet applications where noise may be an issue. Factory gears are the quietest application available on the market and often come at a higher cost. Factory gears come with a one year warranty against defects. When installing this gear set in a 99 & newer 10.5" housing you will need a 10.25" bearing kit.
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