5R55E Overhaul Kit 1997-2005, new and ready to install. Fits the 5R55E. Ships fast from the USA.
This is the Precision International KP53900T overhaul kit, the gasket and seal set for a 1997-2005 Ford 5R55E. Buyers usually find it with a 4.0L Ranger, a Mazda B4000, a 1997-2001 Explorer or Mountaineer, or an Explorer Sport Trac that is leaking from the bellhousing or the extension, takes a moment to find reverse, or is out of the truck for a rebuild. The kit is new in the maker's packaging. The listing photo shows the pan gasket, the valve body and separator plate gaskets, the front pump and rear extension seals, large case O-rings, and bagged rubber seals and sealing rings. Clutch frictions, steel plates, bands, the filter and bushings are not part of it.
The 5R55E became a five-speed in 1997 when Ford started applying the front servo in first gear to create an overdriven second. That puts a lot of the shift pattern on the two bands and their servos, and every servo piston and clutch piston depends on rubber that hardens with heat and age. Sonnax points out that in reverse both servos are charged on the release side and pushed toward their covers, so a servo seal that has hardened or separated shows up as slow or missing reverse. The valve body gaskets matter just as much: Sonnax notes that a separator plate that is not pinned in alignment lets the bolts pull the plate away from the case and leak line pressure, which delays both forward and reverse.
A reseal will not last if something is overpressurizing the case. Sonnax lists a worn pressure regulator bore, boost sleeve wear or a stuck line booster valve as the reasons servo covers get pushed out, and gives 125-130 psi in overdrive and 144 psi in reverse as good maximum EPC. A gauge test tells you whether the valve body needs attention too. Our 5R55 harsh or delayed shifts guide walks through those checks, and the common leak spots guide helps you separate an outside seal leak from an internal one. If the pan holds burnt friction material, budget for plates as well.
Precision catalogs KP53900T for 1997-2005 4R44E, 5R44E and 5R55E units in Ford, Lincoln, Mazda and Mercury applications. For the 5R55E that means the 4.0L trucks of those years. The 2002-up Explorer and Mountaineer are not covered; they use the 5R55W, which takes a different kit. Use the 5R55 identification guide if you are not sure which unit you have. Since the family saw valve body, plate and solenoid changes along the way, compare the gaskets to your old ones before you start, or send us your year, model and engine and we will check it. The rest of this family is on the 5R55 parts page, and for 2006-2011 Rangers see the 1997-2011 5R55E overhaul kit.
If the frictions are worn, add the 5R55E clutch module. Units with burnt bands are better served by the 5R55E master rebuild kit.
| Fits | 5R55E 1997-2005 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | KP53900T |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a gasket and seal overhaul kit. The listing photo shows the pan gasket, valve body and separator plate gaskets, front and rear seals, case O-rings and bagged rubber seals and sealing rings. It does not include frictions, steels, bands, a filter or bushings.
Only an Explorer Sport Trac or other model with the 5R55E. The regular 2002-up Explorer and Mountaineer use the 5R55W, which needs a different overhaul kit.
That is the range Precision catalogs for this part number. For a 2006-2011 truck use our 1997-2011 5R55E overhaul kit, or send us your year and engine and we will match it.
Often, if the servo seals are hard or blown. But Sonnax also ties slow reverse to low line rise, a misaligned separator plate and cracked sealing sleeves, so test line pressure and inspect those during the rebuild.
Mercon V. Pre-soak the lip seals in it and set the final level with the fluid hot.
