4R55E Pump, used and ready to install. Fits the 4R55E. Ships fast from the USA.
The 4R55E went behind the 4.0L Cologne V6 in the Ford Explorer and Ranger for only a short run before the five-speed replaced it, so good used internal parts are getting scarce. If your 4.0L truck crawls into gear after a highway drive, feels mushy pulling a trailer up a grade, or makes a whine that rises with engine speed, a worn front pump is a likely cause. This is a used OEM 4R55E pump for owners and shops who would rather install a factory part than hunt for a core.
Ford rated the 4R55E at 550 lb-ft after converter multiplication, against 440 for the lighter 4R44E, with heavier drive components to suit the Explorer and the 4.0L. The hydraulic supply works the same way as the rest of the A4LD-based family: the converter hub drives the pump through the bell housing, and the pump feeds everything. The EPC solenoid regulates that supply into line pressure, converter charge oil comes off the pressure regulator, and Sonnax notes the TCC regulator valve is fed from line pressure once the converter clutch applies. A heavy SUV leans on that pressure hard on every launch, so a pump that has lost volume shows up first under load and with hot, thin fluid, and the converter clutch starts slipping at cruise.
Rule out the cheaper parts first. Sonnax traces delayed Reverse, flared 1-2 and 2-3 shifts and even broken bands in this family to EPC circuit leakage and a sticking EPC or engagement valve, which a 1995 4R55E valve body or a fresh 4R55E pressure control solenoid can fix without pulling the transmission. Then put a gauge on the line pressure tap with the fluid hot. Low pressure in every range that will not rise with EPC commanded high points at the pump. Our slipping diagnosis guide walks through the order of checks, and the ATF color and smell chart tells you whether the clutches have already paid the price.
Wikipedia lists the 4R55E with the 4.0L V6 in the Ranger and Explorer, gives the Explorer years for the family as 1995-1996, and states the 5R55E replaced the 4R55E in all applications during the 1997 model year. This listing does not state a year, and short-lived units often saw running changes, so confirm the match. The pump is shown in its converter housing, which bolts to the engine, so compare the housing and bolt pattern with yours. Read the transmission code on the door tag or send us your year and VIN and we will check before it ships. A 2.3L or 3.0L Ranger uses the 4R44E pump instead. If your truck is a 1995 or 1996, we also list a 4R55E pump for 1995-1996.
| Fits | 4R55E |
| Part type | Pump |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
The 4.0L V6 Explorer and Ranger from the 1995 model year until the five-speed 5R55E replaced it during 1997. Check the transmission code on the door tag to be sure.
They are close relatives, but the 4R55E is the heavier-duty unit for the 4.0L, and the pump is shown in a converter housing that must match your engine. Order the version that matches your transmission code.
It is a used OEM pump. Inspect it, and check the bushing and converter hub surfaces before you install it.
It can be, because hot fluid is thinner and a worn pump loses more volume. EPC solenoid and valve body leaks cause the same complaint, so test line pressure hot before you buy.
A new front seal and gaskets every time, the bell housing bushing if it is worn, and the clutches and bands if the fluid is burnt. Flush the cooler before startup.
