5R55E Governor Pressure Solenoid, remanufactured and ready to install. Fits the 5R55E. Ships fast from the USA.
People land on this page searching for a 5R55E governor pressure solenoid, usually because a Ford Ranger, an Explorer Sport or a Mazda B4000 has started shifting soft, backing up late or setting a pressure code. The first thing worth knowing is that the 5R55E has no governor and no governor pressure solenoid. That name belongs to Chrysler's RE-series transmissions. What actually ships under this listing is a complete OEM Ford valve body assembly with its solenoids installed, built for the 5R55E and the related 4R44E and 4R55E. It has been cleaned, inspected and tested before shipment, so it goes in as one bench-ready unit instead of a pile of individual solenoids and valves.
In the 5R55E, the PCM never reads road speed through a hydraulic governor. It reads the output shaft speed sensor and then commands the valve body electrically. The shift solenoids select which valves stroke for each gear, the converter clutch solenoid controls lockup, and the electronic pressure control (EPC) solenoid sends signal oil to the boost valve, which pushes on the main regulator to set line pressure. That line pressure is what clamps the intermediate and overdrive bands through their servos. So in this transmission, the job a governor did in older units is split between a sensor and the valve body, and when the valve body wears, every shift that depends on band pressure feels it first.
Sonnax ties delayed reverse, soft shifts and low line pressure in the 4R44E/4R55E/5R44E/5R55E family to wear at the boost valve and its sleeve. That wear is inside the casting, which is why swapping only the EPC solenoid often does not cure it.
Check fluid level and smell first, then pull codes and note whether they are circuit faults or performance faults. Put a gauge on the line pressure tap and have a scan tool command EPC up and down. If pressure does not follow the command, the solenoid or wiring is the problem and our 5R55E EPC solenoid may be all you need. If pressure follows but stays low, or reverse pressure is low while forward is fine, the valve body is the likely cause. If a gear slips with good pressure, look at the servo bores and bands instead. The 5R55 harsh or delayed shifts walkthrough lays out that test order.
The assembly is listed for select 1995-and-later Ford and Mazda trucks with the 5R55E, 4R44E or 4R55E, including the Ranger, Explorer, Aerostar and Mazda B-Series. Ford ran several valve body, separator plate, solenoid and check ball layouts through these years, so year and model alone are not enough. Compare your old unit to the photo, including the solenoid connector, the separator plate design, casting numbers and check ball count, or send us your year, VIN and transmission tag before it ships. This is not the valve body for the later 5R55W or 5R55S used in 2002-up four-door Explorers, Mustangs and the Lincoln LS. Everything else we stock for the family is on the 5R55 parts page.
If the transmission is coming apart anyway, the 5R55E overhaul kit covers the gaskets and seals for the rest of the unit.
| Fits | 5R55E |
| Part type | Governor Pressure Solenoid |
| Condition | Remanufactured |
| 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. The 5R55E is fully electronic and uses an output shaft speed sensor plus an EPC solenoid to control shift timing and line pressure. Governor pressure solenoids are used in Chrysler RE-series transmissions. This listing is a complete 5R55E valve body with its solenoid assembly.
Only if it has the 5R55E. Four-door Explorers and Mountaineers from 2002 on use the 5R55W, and the Mustang, Lincoln LS and Thunderbird use the 5R55S or 5R55N, which take a different valve body. The 5R55E stayed in the Explorer Sport, Sport Trac and Ranger. Send us your VIN if you are unsure.
Test first. If line pressure does not respond when EPC is commanded, the solenoid or wiring is at fault. If it responds but stays low, or reverse pressure is low, the boost valve and valve body bores are worn and the full assembly is the better fix.
Mercon V automatic transmission fluid. Check the level hot with the engine running after the install and top up as needed.
No programming is included or normally needed. Clear the codes, then drive through every gear with light and moderate throttle so the PCM can adapt shift timing to the new valve body.
