5R55S Banner Rebuild Kit 2002-2007, new and ready to install. Fits the 5R55S. Ships fast from the USA.
A 5R55S that slips into gear, slams or delays the forward engagement when warm, or flares on the upshifts is the reason most people end up searching for a rebuild kit for their Explorer, Mountaineer, Mustang V6, Lincoln LS or Thunderbird. This 2002-2007 5R55S banner kit is a focused soft-parts package: a complete overhaul kit (gaskets, seals, O-rings, sealing rings and lip seals), a Raybestos friction clutch pack module (RCP96-139) and a new forward clutch bonded piston. It is built for a rebuild where your steels, bands and drums are still serviceable.
The 5R55S uses the same basic layout as the W, a five-speed built around multi-plate clutches and bands, with variable force solenoids controlling apply pressure. Transmission Digest describes how the 5R55S/W uses dedicated reverse and forward engagement control valves, so any leak at the forward clutch piston shows up first as a slow or harsh Drive engagement. The bonded piston in this kit matters for that reason: its seal is molded to the piston, so it does not roll or cut the way a separate lip seal can, and it restores forward clutch apply. The Raybestos module replaces the clutch frictions in the unit.
Pull the pan and look at the magnet. Fine clutch fiber says the friction packs are done. Heavy band lining or steel plates that are blue and warped mean you need more than this kit, because steels and bands are not included. Also check the overdrive and intermediate servo pin bores, which Sonnax identifies as a common source of slipping on the W and S. Our 5R55 harsh or delayed shift walkthrough runs through pressure checks, and the 5R55S slipping causes guide helps rule out solenoid and valve body faults before you tear the unit down.
This listing covers 5R55S and 5R55W transmissions from 2002-2007. According to Sonnax, the S replaced the 5R55N in the Lincoln LS and Thunderbird for 2003 and replaced the W in Explorers and Mountaineers for 2004-2005; the 2005-up Mustang V6 also uses the 5R55S. Because the S and W share friction and seal sizes, the same kit serves both, but hard parts like the overdrive sun gear do not interchange. The 5R55N is a different unit and should not get this kit. Check the code on the door-jamb label and the case tag, or send us your year and VIN. See every 5R55 part by version on our 5R55 parts page.
Needing steels too? The 5R55S banner kit for 2002-2005 includes friction and steel plates. For worn valve body bores, add a 5R55S valve body for 2002-2008.
| Fits | 5R55S 2002-2007 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A complete overhaul kit with gaskets, seals, O-rings, sealing rings and lip seals, a Raybestos friction clutch pack module (RCP96-139) and a forward clutch bonded piston. Steel plates, bands and a filter are not included.
Yes. It is listed for both the 5R55S and 5R55W from 2002-2007, since they share friction and seal sizes. It is not for the earlier 5R55N used in the Lincoln LS and Thunderbird before 2003.
A leaking forward piston causes delayed or harsh Drive engagement once the fluid warms up. The bonded piston has its seal molded on, which restores apply pressure more reliably than reusing the old piston.
Use Mercon V. The installation guide lists about 11.2 quarts dry with the 3.0L or 3.9L and 12.4 to 12.7 quarts with the 4.0L or 4.6L. Set the final level hot at the T30 Torx check plug.
Not always, but Sonnax notes early Mercon V fluid used before May 2005 degraded solenoids in these units. If the pack is original on a high-mileage vehicle, test it or replace it while the pan is off.
