4R100 Pump 1998-2005, remanufactured and ready to install. Fits the 4R100. Ships fast from the USA.
When a 1998-2005 Ford with the 4R100 whines in step with engine speed, takes a long time to pick up drive or reverse, or slips in every gear once it is hot, the front pump is the first suspect. This remanufactured 4R100 pump for 1998-2005 is for Super Duty pickups, Excursions, E-Series vans and F-53 chassis behind the 7.3L Power Stroke, 5.4L and 6.8L V10, and it replaces a worn pump as a complete assembly instead of a pile of loose gears and bushings.
The pump bolts to the front of the case and is driven by the torque converter hub. Its gears produce every bit of oil the transmission uses: line pressure for the clutches and band, converter charge, cooler flow and lube. In the 4R100 the pump also carries the torque converter clutch control valve in its body, which is why pump design and solenoid block design are tied together. For 1998 Ford moved to a common pump body and cover casting marked F81P that was used for three different assemblies: the E4OD, the 4R100 with on-off converter clutch control, and the 4R100 with PWM converter clutch control. The castings look alike, but the TCC valve hardware inside does not.
Put a gauge on the line pressure tap before you pull anything. Low pressure in every range points at the pump or the main regulator, while a single bad shift points elsewhere. Rule out the pressure control solenoid and its wiring, since a failed EPC circuit can also cause soft shifts and low pressure; our EPC solenoid symptoms guide shows how to separate the two. Check that the cooler is not restricted using our cooler line guide, because a blocked cooler cooks a fresh pump fast. Once the pump is out, a scored gear pocket, worn bushing or chewed gears confirm it.
This pump is listed for the 1998-2005 4R100. The most important check is converter clutch type. A PWM pump uses a long sleeve with a valve in the TCC bore, so the end plug sits only about 1/4 inch below the pump cover edge. On an on-off 4R100 or an E4OD pump that plug sits more than an inch down. Look into your old pump's TCC bore and measure before you order. The solenoid block must match the pump design, not just the model year, or the converter clutch will not behave. All diesel 4R100s and many gas units ran PWM control, with only some gas applications on the on-off style. If you are unsure, send us your year and VIN and we will confirm. Other year ranges, such as the 1998-1999 4R100 pump, are listed separately, and every part for this family is on the E4OD and 4R100 collection page.
For the full breakdown of what changed from E4OD to 4R100, read 4R100 vs E4OD differences.
| Fits | 4R100 1998-2005 |
| Part type | Pump |
| 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.
Look into the TCC valve bore on your old pump. On a PWM pump the end plug is recessed about 1/4 inch from the pump cover edge because it is a long sleeve with a valve inside. On an on-off 4R100 or an E4OD pump it sits more than an inch down.
Not automatically. A 4R100 PWM pump is a different design from the E4OD pump, and the solenoid block has to match the pump. Send us your year and VIN, or check the TCC end plug depth, before mixing parts between the two units.
Common causes are debris from a failing clutch or converter, a worn converter hub chewing the bushing, low fluid, and overheating under towing. Find and fix the cause or the replacement pump will wear the same way.
Inspect it. A damaged converter hub, excessive endplay or debris in the converter will hurt a new pump. Sonnax calls for at least about .035 to .040 inch converter endplay on a 4R100.
MERCON V automatic transmission fluid. Prime the pump with it before the first start and check the level at operating temperature after a test drive.
Yes. Low pump volume at low RPM can fail to supply enough converter release oil, letting the converter clutch drag. That history goes back to the E4OD, and the 4R100 inherited it.
