5R55E Solenoid Kit 1997-2011, new and ready to install. Fits the 5R55E. Ships fast from the USA.
Owners of 1997-2001 Ford Explorers, 2001-2005 Explorer Sport Tracs and Rangers with the 5R55E usually find this page after the truck locks into one gear on the highway, flares between third and fourth, or keeps setting solenoid codes that come back right after they are cleared. This kit replaces all six solenoids on the 5R55E valve body at once: four on/off shift solenoids, the EPC pressure control solenoid and the TCC lockup solenoid. It is listed for 1997 through 2011 under reference A56420K, and it is the repair to make when testing shows the coils, not the valve body, are at fault.
The 5R55E shares its valve body casting with the 4R44E, 4R55E and 5R44E, and uses bands for the intermediate and overdrive members. The PCM runs every part of the shift through these six parts. The shift solenoids switch the shift valves to select each gear. The EPC solenoid sends a signal pressure to the boost valve and pressure regulator, which decides how hard the bands and clutches are applied. The TCC solenoid locks the converter. When the EPC signal is weak, the bands apply soft and slip, so a bad EPC solenoid shows up as flared shifts and, left alone, as band wear.
Read the codes and freeze-frame data, then pull the case connector and look at the pins. Fluid that has wicked up through the connector is a common cause of intermittent solenoid codes. Measure each solenoid at the connector and compare the readings to the factory spec. Then put a gauge on the line pressure tap and command EPC. If pressure does not follow the command, you have a pressure control fault. Sonnax also points to fluid as a root cause in the 5R55E and its W, S and N relatives. Early Mercon V factory fill used before May 2005 degraded solenoids, and any old fluid left in the unit can shorten the life of new ones. For a full step-by-step test, use our 5R55 harsh or delayed shift guide.
The kit is listed for the 5R55E, 5R44E, 4R55E and 4R44E. Its vehicle list covers the 1997-2011 Ranger, 1997-2001 Explorer, 2001-2005 Explorer Sport Trac and 1997 Aerostar, along with the Mazda B2300, B2500 and B4000. Be careful with Explorers. Four-door models from 2002 on use the 5R55W or 5R55S, which have a bolt-on solenoid block and will not take this kit. Read the tag on your case, compare each old solenoid to the new one by shape, O-rings and connector, and send us your year and VIN if anything does not match. Everything else we stock for this transmission is on the 5R55 collection page.
| Fits | 5R55E 1997-2011 |
| Part type | Solenoid Kit |
| Condition | New |
| Brand | OEM |
| Reference | A56420K |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Only if it is the two-door Explorer Sport. The four-door Explorer and Mountaineer from 2002 on use the 5R55W or 5R55S, which take a one-piece solenoid block. Check the tag on the transmission case or send us your VIN.
Four shift solenoids, one EPC solenoid and one TCC lockup solenoid. That is all six solenoids the listing names for the 5R55E.
Not if the slip comes from a worn overdrive band or servo, which can set P0735 with perfectly good solenoids. Pressure test the unit and inspect the band and servo before you replace the solenoids.
Use current Mercon V. Sonnax ties early solenoid failures to the original factory fill, so remove as much of the old fluid as you can when you install the kit.
Yes. Clear the codes, reset the adaptive tables, and drive the truck through every gear and through converter lockup so the PCM can relearn shift pressure.
