This listing is for a clean used ford 9.75" rear Trac Lok OEM limited slip differential with 3.55 OEM gears. These parts were removed in perfect working condition and were replaced with a selectable locker and 4.56 gears for improved off-highway performance. These parts are in great shape and need a good home and are rarely found in this good of condition. These parts will fit any 5.4L V8 in any Ford full size F150 or Expedition, even vans from 1997 to 2016. These parts were carefully removed and will be properly packaged to ensure safe delivery right to your door. Parts like this sell new for over $750 so don't miss out on genuine forward quality at this low price. Thanks for looking!