4R100 Pump 1998-2004, remanufactured and ready to install. Fits the 4R100. Ships fast from the USA.
Most 4R100s that come in with a tired pump have done years of towing behind a 7.3L Power Stroke or a V10, and the complaint is usually the same: the truck sits a beat too long before it takes drive or reverse, it flares or slips under load in every gear, and there is a whine that rises with engine speed. This remanufactured 4R100 pump is listed for the full 1998-2004 run, covering Super Duty pickups and chassis cabs, Excursions, E-Series vans and F-53 motorhome chassis.
The pump gears are turned by the converter hub through a steel-backed bushing, and every drop of oil in the transmission starts here. Line pressure, converter charge, lockup release oil, cooler flow and lube all come off the pump. The pump body also houses the valves that control that oil. The Sonnax vacuum test guide places the main regulator valve, the converter regulator valve and the converter clutch control valve in the 4R100 pump body. After years of hot fluid those valves wear their aluminum bores, and pressure leaks away even when the gears are still serviceable. A remanufactured pump replaces the gears, bushing and valve hardware as one tested assembly.
A line pressure gauge is the fastest test. Check idle and stall readings in drive and reverse; low numbers everywhere mean the pump or its regulator, not one clutch pack. The EPC solenoid controls line rise on these trucks, so rule it out with our EPC solenoid guide, and check the solenoid block and connector using our E4OD and 4R100 common problems guide, since connector faults on this family are common. Once the pump is out, scored gear pockets or a wallowed bushing confirm the call.
This pump is listed for the 1998-2004 4R100 in Ford F-250, F-350, F-450, F-550 Super Duty, Excursion, E-Series and F-53 with the 7.3L diesel, 5.4L or 6.8L V10. Sonnax lists one pump gear set that fits all 4R100 pumps, but the valve hardware is not universal: the converter clutch control valve differs between PWM and non-PWM 4R100s. Compare your old pump's casting and TCC valve with the photos, match the lockup control your solenoid block uses, and if in doubt send us the year and VIN. A 1998-1999 4R100 pump is also listed, and the whole family is on the E4OD and 4R100 collection page.
Not sure if you have the earlier unit? Read 4R100 vs E4OD differences.
| Fits | 4R100 1998-2004 |
| 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.
It is listed for the 1998-2004 4R100, which was used behind the 7.3L Power Stroke, 5.4L and 6.8L V10. The lockup control valve differs between PWM and non-PWM units, so match your old pump or send us your year and VIN.
Sonnax lists one pump gear set that fits all 4R100 pumps. The valves in the pump body are what change, especially the converter clutch control valve for PWM and non-PWM units.
Inspect it at minimum. A damaged converter hub wears the new bushing and seal and is linked to repeated pump and converter failures. Replace it if the hub is scored or the converter is contaminated.
Use MERCON V. Pour fluid into the converter and pump before installing, then check the level hot after a road test.
Only if the pump valves or low pump volume are the cause. Sonnax links worn pump body valves to lockup shudder, TCC cycling and codes 628 and 1744, but the solenoid block and converter can cause the same symptoms.
