4R100 Clutch Drum 1999-2004, remanufactured and ready to install. Fits the 4R100. Ships fast from the USA.
Most 4R100 transmissions built from 1999 to 2004 went behind the 7.3L Power Stroke, the 6.8L V10 or the 5.4L in F-250 through F-550 Super Duty trucks, the Excursion and E-Series vans, and a lot of them have spent their lives hauling trailers. When one of these units starts slipping in a single gear, comes back from a rebuild missing a range, or leaves a layer of burnt friction in the pan, the clutch drum for that pack belongs on the inspection list. This is a remanufactured 4R100 clutch drum listed for 1999-2004, a direct replacement when the original drum is cracked, scored or heat damaged.
The 4R100 is the 1998-on version of the E4OD: an overdrive planetary and its clutches up front, then the C6-derived main section behind the center support. Each clutch drum is a housing with internal splines for the steel plates, a bore for the apply piston and return springs, and a hub with sealing ring lands where pressurized fluid crosses from a stationary support or a turning shaft into the drum. When the valve body commands a gear, that oil strokes the piston and locks the pack. The drum has to stay round, crack-free and sealed under the torque a diesel makes at low rpm, which is a lot to ask of a part that may have seen 200,000 miles of towing.
Two weak spots in this family land directly on the drums. Sonnax lists input drum wear at the center support and leaking intermediate and direct clutch feed passages at the case and center support, and a leaking feed passage starves the drum no matter how good the drum itself is. Sonnax's 4R100 flow article also describes low pump volume at low engine speed, which is why a diesel truck idling with a heavy load can be hard on clutches and the converter clutch alike. Our 4R100 vs E4OD guide covers the coast clutch drum and support changes Ford made for the PTO-capable 4R100.
On a 1999-2004 truck, scan for codes first. An EPC fault such as P1747 can cause soft shifts and a gutless feel that looks like a mechanical slip, so read our EPC solenoid symptoms guide and test the solenoid pack before blaming hard parts. Put a gauge on line pressure if you can. If pressure is good and the slip follows one gear, pull the unit, air-check every clutch circuit, and inspect each drum for heat bluing, cracked lugs, a worn bushing and scored sealing ring lands. A drum that bleeds air at the lands or has a cracked wall should be replaced, not resealed.
This drum is listed for the 1999-2004 4R100. The listing does not say which position it is or give a Ford part number, so lay it next to the drum you are removing and compare height, spline count and lug pattern, bushing or bearing support, and any external gear. 4R100 units were built in PTO and non-PTO versions, and Ford used different parts for each. If you are not certain, send us your year, engine, VIN and a photo of the old drum before ordering. The full range of parts for this transmission is on the E4OD and 4R100 parts page.
Inspect the remanufactured drum on the bench, then fit new sealing rings and piston seals, lubricated with fluid or assembly gel. Stack fresh frictions and steels, air-check the piston, and set clearance to the factory spec for that pack. While the case is open, check the center support for wear at the drum journal and the case feed passages for leaks. A full seal and gasket set such as the 4R100 overhaul kit for 1999 covers the soft parts. If you found metal in the pan, inspect the overdrive one-way clutch too; the 4R100 sprag clutch is a common add-on. Flush the cooler and lines, refill with MERCON V, and check the level hot in Park.
| Fits | 4R100 1999-2004 |
| Part type | Clutch Drum |
| 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.
Only if the truck has a 4R100. Most 2003-2004 6.0L Super Duty trucks use the 5R110W five-speed, which this drum does not fit. Check the transmission tag or send us your VIN.
Yes, for some drums. Ford built the 4R100 with and without a PTO provision and used different parts for each. Compare the external gear and support style with your old drum before installing.
The frictions and steels for that pack, piston seals, sealing rings, a filter and a gasket set. Check the center support and case feed passages, which leak on high-mileage units.
Yes. A weak EPC solenoid, worn modulator valve or low pump output reduces apply pressure and causes slip. Test pressure before replacing the drum.
MERCON V automatic transmission fluid. A towing truck should also have a clean, unrestricted cooler.
