5R55E Solenoid Kit 2001-2005, remanufactured and ready to install. Fits the 5R55E. Ships fast from the USA.
The 2001-2005 Ford Explorer Sport Trac is the truck most people mean when they search for this kit, along with the Ranger and Mazda B4000 of the same era. All of them use the 5R55E five-speed, and when one starts flaring between gears, dropping into a fail-safe gear, or lugging with the converter clutch locked at low speed, the six valve body solenoids are a sensible place to start. This remanufactured set includes four shift and coast solenoids, one electronic pressure control (EPC) solenoid and one torque converter clutch (TCC) solenoid, so you replace the full electrical side of the valve body at once instead of guessing which piece is weak.
The 5R55E has no throttle cable or governor. The powertrain computer decides every shift and fires the on/off shift solenoids to move the shift valves. The coast clutch solenoid controls engine braking, and the EPC solenoid is a variable force solenoid that sets line pressure for every band and clutch apply. The TCC solenoid is pulsed so the converter clutch slips smoothly into lockup instead of slamming. Because line pressure and lockup are both electronic, a weak EPC coil or a TCC solenoid that sticks shows up first as shift quality complaints, often well before any code sets.
Start with fluid level and condition, then scan for codes and watch the commanded gear against what the truck is actually doing. Measure each solenoid at the connector and look for fluid that has wicked into the connector housing. A line pressure gauge tells you the most. Sonnax research found that more than eighty-five percent of used EPC solenoids did not meet its testing criteria, so a weak EPC is common on high-mileage trucks. Sonnax also warns that a new EPC can raise pressure enough to mask worn valve body bores, and the problem then comes back. If pressure stays low with new solenoids, plan on the Sonnax Zip Kit for this valve body. For a P0735 or fifth-gear slip, work through the servo checks in our 5R55 shift diagnosis guide first.
This set is listed for the 5R55E, 5R44E, 4R55E and 4R44E. Ford applications: 2001-2005 Explorer Sport Trac, 1997-2011 Ranger, 1997-2001 Explorer, and the 1997 Aerostar. Mazda applications: 1997-2010 B2300 and B4000 and the 1998-2001 B2500. Watch the body style on Explorers. From 2002 the four-door Explorer and Mountaineer switched to the 5R55W, and later the 5R55S, which use a one-piece solenoid block that this set does not replace. The redesigned 2007-up Sport Trac is not covered by this listing either. Confirm the 5R55E tag on your case, or send us your year and VIN before you order. The 5R55 identification guide shows how to tell the variants apart, and the 5R55 collection lists everything else we carry for this unit.
| Fits | 5R55E 2001-2005 |
| Part type | Solenoid Kit |
| Condition | Remanufactured |
| Brand | OEM |
| Reference | B4000 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. The 2001-2005 Explorer Sport Trac is one of the listed applications for this 5R55E set. Check the tag on your transmission case or send us your VIN to be sure.
No. Four-door Explorers and Mountaineers from 2002 on use the 5R55W or 5R55S with a one-piece solenoid block. This set is for the 5R55E used in the Sport Trac, Ranger, two-door Explorer of 1997-2001 and Mazda B-series.
Six remanufactured solenoids: four shift and coast solenoids, one EPC solenoid and one TCC lockup solenoid. Plan to buy a filter and pan gasket separately.
It can be, but old fluid and a worn converter clutch cause the same shudder. Change the fluid and filter, then check whether the commanded lockup duty cycle is high while slip stays high. If it is, the TCC apply circuit is not getting enough pressure.
Clear the codes and reset the computer's adaptive memory, then drive the truck through every gear under light and moderate throttle so it can relearn shift pressures.
