5R55W Master Rebuild Kit 2008, new and ready to install. Fits the 5R55W. Ships fast from the USA.
If you are shopping for a 5R55W rebuild kit, the transmission in front of you is probably an Explorer or Mountaineer unit that has started to slip, bang into gear or lose engine braking. This kit packages the clutch and seal parts a W wears out. It is listed as Raybestos banner kit W16004GAP, built for 2008-up 5R55W and 5R55S transmissions, and it contains an overhaul gasket and seal kit with a bonded piston, plus a full set of high-energy frictions for the forward, direct and overrun clutches.
There are no steels, bands or filter in this kit. That keeps the price well below a full master kit. It is the right choice when you tear down a W and find flat, evenly colored steels and bands with usable lining. If the steels are blued or the bands are burnt, the 5R55W master rebuild kit for 2000-2010 includes those parts.
The W has a reputation for problems that look like clutch failure but come from elsewhere. Sonnax reports that worn VFS modulator bores in the valve body reduce clutch and servo pressure until the computer can no longer compensate, and that solenoid packs often get replaced when the real cause is degraded fluid or a lost prime. ATRA's GEARS magazine documented a 2006 Explorer with severe delayed forward engagement and normal solenoid readings, where the forward clutch was the only damaged part. In cases like that, this kit is the fix. Start with our 5R55W Explorer slipping guide, and if the complaint is a long delay into drive or reverse, also read the 5R55 delayed shift walkthrough before you pull the unit.
Sonnax describes the W as the Explorer and Mountaineer unit for 2002-2003. The S, with its 38-tooth overdrive sun gear instead of the W's 24-tooth gear, took over in later years. The two share soft parts, which is why this kit is catalogued for both. The listing is for the 2008 version. If your unit was built before 2008, look at the earlier kits on the 5R55 parts page, or count teeth on your old frictions and compare them to the ones listed above. Send us your year and VIN and we will confirm the fit before it ships. Do not use this kit on a 5R55N. Sonnax notes that only a few N parts interchange with the W.
| Fits | 5R55W 2008 |
| Part type | Master 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.
No. It is a banner kit: a complete overhaul seal and gasket kit, a bonded piston, and 12 frictions for the forward, direct and overrun clutches. Steels, bands and the filter are not included.
The kit is catalogued for 2008-up W and S units. Earlier units may need the earlier kit. Count the teeth on your old frictions (89 forward, 48 direct, 16 overrun) or send us the year and VIN so we can confirm the fit.
A worn forward clutch is a common cause, and this kit replaces it. Pressure loss from valve body wear can cause the same delay, so check line pressure and the fluid condition before you tear the unit down.
Mercon V. A dry unit behind the 4.0L or 4.6L takes about 12.4 to 12.7 quarts. Final level is set with the fluid hot at the T30 Torx check plug.
No. Sonnax notes that only a few 5R55N parts interchange with the W and S, and that mixing parts can cause problems. Use an N-specific kit for those.
