4R55E Shift Kit 1995, remanufactured and ready to install. Fits the 4R55E. Ships fast from the USA.
Owners of a mid-1990s Ford Explorer, 4.0L Ranger or Mazda B4000 with the four-speed automatic often go looking for a 4R55E shift kit once the truck starts sliding through the 2-3 shift while towing, takes a beat to engage reverse, or never pulls the converter into lockup on the highway. This listing carries that name, but the part is a remanufactured set of six OEM-style solenoids that bolt to the valve body, inspected for proper operation and catalogued for the 4R44E, 4R55E, 5R44E and 5R55E family from 1995 on. It is not a hydraulic recalibration kit. If you want one of those, we carry the TransGo SK44-55E shift kit for the 4R55E separately. Many 4.0L trucks that feel like they need a shift kit are actually short on pressure from a tired EPC solenoid, which is what this set replaces.
The 4R55E is the heavy-duty half of Ford's first electronic version of the A4LD, built with stronger drive components for the 4.0L Cologne V6 and rated for about 550 ft-lb after converter multiplication, against 440 for the lighter 4R44E. It had a short life: the five-speed 5R55E replaced it in every application during the 1997 model year. Sonnax dates the 4R55E to the 4.0L for 1996, while other references list it from 1995, so treat any 1995 Explorer or 4.0L Ranger as a VIN check. Because these trucks towed and carried more than the four-cylinder Rangers, they put more heat through the pressure and lockup circuits, and that is where solenoid wear shows up first.
The computer makes every shift decision. Four on/off solenoids stroke the shift valves and the coast clutch valve. The EPC solenoid controls line pressure and also supplies the EPC boost valve, which Sonnax describes as acting like a booster that raises pressure further as EPC output climbs. The TCC solenoid ramps converter lockup, and the TCC regulator valve is fed by that same line pressure. A weak EPC solenoid therefore costs you both firm shifts and a firm lockup.
Read the codes, then measure each solenoid at the case connector. Our guide to bench testing transmission solenoids shows how to check them once they are out. A line pressure test tells you whether the problem is electrical or hydraulic, and our 5R55 harsh and delayed shift guide walks through the same valve body circuits this family shares. If pressure stays low with good solenoids, look at worn valve body bores and the EPC boost valve, which a remanufactured 4R55E valve body addresses in one piece.
Listed for the 4R55E from 1995, the four-speed behind the 4.0L V6 in the Explorer, Ranger and Mazda B4000 until the 5R55E took over in 1997. A 1997 truck may have either unit, so check the transmission tag: a five-speed needs 5R55E parts. Ford revised valve bodies, separator plates and solenoids more than once, so match your old solenoids and plugs to the photo, or send your year and VIN before ordering. The 4R55E solenoid kit for 1995 and the 1995 4R55E TCC solenoid are other ways to buy for the same unit.
| Fits | 4R55E 1995 |
| Part type | Shift Kit |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
No. What ships is a six-piece remanufactured solenoid set. The TransGo SK44-55E hydraulic shift kit is listed separately as our 4R55E shift kit 1994-07.
The 4R55E went behind the 4.0L V6 and is a four-speed. The 4R44E was used with the 2.3L and 3.0L, and the five-speed 5R55E replaced the 4R55E during 1997. Read the transmission tag or send us your VIN.
Test line pressure first. Low pressure rise usually means a worn EPC solenoid or valve body, which a shift kit cannot fix. If pressure is normal and the shift is still slow under load, a shift kit is the better buy, ideally with fresh solenoids.
It can if the TCC or EPC solenoid is the cause. Sonnax also points to the stator shaft seal, a worn TCC regulator bore and the converter itself, so test before replacing parts.
MERCON V, which superseded the original MERCON. Check the level with the engine idling and the fluid at operating temperature.
