4R100 Overhaul Kit 1998-2005, new and ready to install. Fits the 4R100. Ships fast from the USA.
Ford built the 4R100 from 1998 on as the heavy-duty replacement for the E4OD, and it went into Super Duty pickups, Excursions and E-Series vans with the 7.3L Power Stroke, 5.4L and 6.8L V10. After years of towing and plowing, the common complaint is the same: a soft or late shift that gets worse as the fluid heats up, a long pause before Reverse catches, and leaks that come back after every pan gasket. This new 4R100 overhaul kit covers the full 1998-2005 production span and is pictured with clutch frictions, a band, a filter, the case and valve body gaskets, the lip seals and the O-ring and sealing ring set.
The 4R100 applies six clutch packs and two bands with hydraulic pressure that starts at the pump and is regulated by the EPC solenoid. Every circuit between the pump and a clutch piston is sealed by a ring, a gasket or a molded piston seal. When those parts harden, pressure leaks away before it reaches the piston, so the clutch applies late and slips. A full reseal restores the holding pressure, and new frictions give the restored pressure something to grip. The kit is the base of a rebuild; the hard parts you reuse still need to match each other, which is where 4R100 builds go wrong.
Codes such as P1747 for the EPC circuit can make a healthy 4R100 feel weak, and Transmission Digest documented a 2002 F-550 where a failed PCM driver caused exactly that. Scan first, check line pressure with a gauge, and read our EPC solenoid symptoms guide and valve body symptoms guide. If pressure is correct and the unit still slips, the clutches and seals are the problem.
The listing is for 4R100 units from 1998 through 2005. That range includes running changes, so match the parts you reuse rather than the year alone:
Read the ID tag or send us your year and VIN and we will confirm the kit before it ships. Browse the whole E4OD and 4R100 collection for matching hard parts.
| Fits | 4R100 1998-2005 |
| Part type | Overhaul Kit |
| Condition | New |
| 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.
The seal and gasket set covers the 4R100 family, but diesel and many gas units use PWM converter clutch control while some gas units use on-off lockup. Send your VIN and we will confirm the kit for your truck.
Mismatched hard parts, such as a pump and solenoid block of different converter clutch types, and debris left in the cooler. Both are avoidable with careful matching and a flush.
MERCON V. Ford's capacity chart lists different approximate dry-fill amounts for 4x2 and 4x4 trucks, so fill to the dipstick hot rather than to a number.
If it tests out of spec or the connector is damaged, yes. The 4R100 solenoid pack and connector are frequent failure points, and access is easiest with the unit out.
Seals overlap in places, but pump, drum and case details changed in 1998. Use a kit matched to an E4OD for 1989-1997 units.
