Power steering gear box, gearbox, professionally remanufactured to OEM specs, hydraulically tested. Modele ZF. New seals, new bearings, shaft replaced and hight pressure tested. OEM # STG285, 8C3Z3504B, 5C3Z3504BA, 8C3Z-3504-B, 5C3Z-3504-BA. Fit on Ford F350 2008, 2009 4WD and w/wide track fat boy Suspension, F450 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, F550 2005-2015. 30 years of power steering remanufactured. This item requires a $475 refundable core deposit in addition to the purchase price. UPS cheapest rates will be charged on your credit card to pay return core shipping. This charge will be applied on the core refund. All UPS return paperworks will be includes with the shipment. Just call UPS to get the core picked up ready with papers we provide you.