5R55S/5R55W Transmission Master Rebuild Kit, Ford Explorer

This is a banner-level rebuild kit for the Ford 5R55S and 5R55W five-speed rear-wheel-drive automatic, the transmission Ford ran behind the 2002-2007 Explorer and Mountaineer, the 4.0L Ranger, the Mustang V6, and the Lincoln LS and Thunderbird. It pairs a full overhaul gasket and seal set with a new Raybestos Powertrain friction clutch pack (module RCP96-139) so the wear items that actually fail come in one box (WIT part W16004GP).

Inside you get the complete rubber overhaul: pan and case gaskets, o-rings, sealing rings, lip seals and the bonded pistons, plus the Raybestos friction plates for every clutch pack. On the bench you strip the unit, clean and inspect the drums and servo bores, then reassemble with fresh frictions and new seals torqued to spec. It does not include the steel plates, filter or hard parts, so plan to reuse good steels or order them alongside.

The 5R55S/5R55W usually comes apart for slipping or flared shifts, a burnt overdrive or reverse clutch, or a harsh 1-2 caused by hardened seals and glazed frictions. Replacing every friction and every seal in one pass is what gets the unit shifting clean again and keeps you from splitting the case a second time over a single leaking o-ring.