4R100 Pump 1998-1999, remanufactured and ready to install. Fits the 4R100. Ships fast from the USA.
The 1998 and 1999 model years are where Ford's heavy-duty four-speed changed names from E4OD to 4R100, and they are also the years most likely to confuse a parts order. If your 1998-1999 F-250, F-350, E-Series van or first-year Super Duty is slow to grab drive or reverse, slips in every gear once warm, or makes a whine that climbs with engine speed, a worn front pump is a strong suspect. This is a remanufactured 4R100 pump listed for 1998-1999, sold as a complete assembly.
The pump is driven by the torque converter hub and feeds the entire transmission: line pressure for every clutch and the band, converter charge, cooler flow and lube. In this family the pump body is also a small valve body. The Sonnax E4OD/4R100 vacuum test guide lists the main regulator valve, the converter regulator valve and the converter clutch control valve in the pump body, and it shows three different converter clutch control valves: one for the E4OD, one for the 4R100 non-PWM, and one for the 4R100 PWM. That is the reason a pump that looks right on the bench can still be wrong for your truck in these changeover years.
Start with a line pressure gauge. Low pressure in every gear points at the pump or its regulator valve, while a problem in a single gear points at a clutch or a shift circuit. Because the pressure control solenoid also sets line pressure, test it and its wiring first using our EPC solenoid guide. Lockup complaints can come from the solenoid block or the valve body as well, so work through our valve body testing guide before you blame the pump. Bronze and aluminum glitter in the pan backs up a pump diagnosis.
This pump is listed for the 1998-1999 4R100 in Ford F-250, F-350, F-450, F-53, E-Series and early Super Duty trucks behind the 7.3L Power Stroke, 5.4L and 6.8L V10. For a 1998 truck, read the transmission ID tag first and make sure you have a 4R100, not a late E4OD. Then match the converter clutch type: PWM and non-PWM 4R100 pumps use different control valves, and the pump has to agree with the solenoid block and the PCM strategy. The safest move is to compare the casting and the TCC valve on your old pump against this one, or send us your year and VIN and we will check it. If your truck is a 2000 or later, see the 1999-2003 4R100 pump, and every part for the family is on the E4OD and 4R100 collection page.
For the changes Ford made when the E4OD became the 4R100, read 4R100 vs E4OD differences.
| Fits | 4R100 1998-1999 |
| 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.
1998 is the changeover year, so check the transmission ID tag on the case rather than going by the model year. This pump is listed for the 4R100. If you are unsure, send us the year and VIN.
Yes. The 4R100 pump carries the converter clutch control valve, and Sonnax lists separate valves for PWM and non-PWM 4R100 pumps. Match the pump to the solenoid block and strategy your truck already has.
Sonnax recommends at least .035 to .040 inch on a 4R100 so converter release oil can get past the turbine hub bearing. Too little endplay makes the lockup clutch drag on the cover.
MERCON V. Prime the new pump with it before the first start and check the level at operating temperature.
It can. Sonnax ties worn main regulator valves in the pump body to codes 62, 628 and 1744, along with engine stumble or stall on reverse engagement. Rule out the solenoid block and EPC circuit too.
