4R100 Clutch Drum 1989-04, new and ready to install. Fits the 4R100. Ships fast from the USA.
Searching for a 4R100 clutch drum usually means a Super Duty, Excursion or E-Series is down with a slipping gear, burnt clutches or a rebuild that did not hold. This is a new drum listed for the Ford E4OD and 4R100 family across 1989-2004, which makes it a candidate for a 1998-2004 4R100 behind the 7.3L Power Stroke, 5.4L or 6.8L V10 as well as the earlier E4OD. New hard parts take the guesswork out of a rebuild: no hidden cracks, no heat history and fresh sealing surfaces.
Ford rated the 4R100 for heavy truck torque, and it gets that capacity from multi-disc clutches rather than bands for most of its shifts. Every one of those clutches lives in a drum. Apply oil enters through the sealing rings on the drum hub, pushes the piston and clamps the plates; when the oil is released, return springs pull the piston back. The drum is under pressure, heat and torque at the same time, so a small leak at a ring land or a hairline crack becomes a slipping clutch when the truck is loaded.
The 4R100 carries more torque than the E4OD it replaced, and that leaves less margin when something in the clutch circuits leaks. Sonnax lists case feed passage leaks behind burnt intermediate clutches and direct clutch failure in this family, and the same leak that a light-duty E4OD survives can take out a 4R100 pack quickly under towing.
Many 4R100 slip complaints start outside the clutches. Solenoid pack faults, broken connector lock tabs and EPC problems all cause shift quality complaints that look mechanical. Start with codes, fluid condition and a line pressure test, then use our E4OD and 4R100 problems guide to work through the electrical checks. Once those pass and a single gear still slips, the drum and its pack are next. With the unit apart, air-check each circuit and inspect the drum for cracks, heat color and worn ring lands.
This drum is listed for 1989-2004, which takes in both the E4OD and the 4R100. The 4R100 replaced the E4OD for 1998, and the two share their basic architecture but not every part. The listing does not give the drum position or a Ford part number, so set the new drum next to your old one and compare height, spline count, bushing or bearing support and piston bore before installing. Coast clutch drums are the trap here: the 4R100 used separate PTO and non-PTO versions, later revised from bushing to bearing support, and none of those match the cast iron E4OD drum. A 4R100 case with a PTO port needs the PTO style. Read our 4R100 vs E4OD breakdown for the identification checks, or send us your year and VIN. More parts for your unit are on the E4OD and 4R100 collection.
Lube new sealing rings and piston seals, install the piston and return springs, and build the pack with new frictions and steels. Set clutch clearance to the factory spec and air-check before final assembly. A full set of seals, frictions and gaskets comes in the 4R100 master rebuild kit. While the overdrive section is apart, replace the open-end overdrive piston retaining ring with a locking style ring, since a ring that walks out can wreck a 4R100. Refill with MERCON V, and if the old unit failed from slipping, test the solenoid pack too; the 4R100 solenoid kit fits 1998-2004 units.
| Fits | 4R100 1989-04 |
| Part type | Clutch Drum |
| 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.
It is listed for the E4OD and 4R100 family from 1989-2004. Because the listing does not name the drum position, compare it to your old drum and confirm before installing, or send us your year and VIN.
Yes, this is a new clutch drum, not a used core.
The 4R100 case has a PTO port and the E4OD case does not. 4R100s were built from 1998 on; E4ODs from 1989 to 1997.
Heat from towing, low or burnt fluid, and pressure leaks at sealing rings, feed passages or bushings. Each of these lets the clutch slip, and the slip overheats the drum.
MERCON V automatic transmission fluid, with a cooler flush so old debris does not return.
