4R55E Input Drum, used and ready to install. Fits the 4R55E. Ships fast from the USA.
The 4R55E only lived a short life, behind the 4.0L Cologne V6 in mid-1990s Explorers and Rangers before Ford turned it into the five-speed 5R55E for 1997. That makes good front-section hard parts harder to find. If your 4.0L truck has lost overdrive, slips into fourth, or coasts with no engine braking in manual low, this used OEM set covers the parts that most often take the hit: the overdrive drum and the overdrive planetary assembly. It is called the input drum because it is the first gearset behind the pump, driven directly by the turbine shaft. You get the pieces shown in the photo: drum, carrier, sun gear, and ring gear with shaft.
The 4R55E is the heavier-duty sibling of the 4R44E, rated at 550 lb-ft after converter multiplication against 440 for the 4R44E. Both carry the A4LD design, an overdrive gearset added to the front of the old C3 three-speed. In first through third this gearset turns as a unit through its one-way clutch. In fourth the overdrive band grabs the outside of the drum, holds the sun gear still, and the carrier drives the ring gear into overdrive. The coast clutch is inside the drum and applies in manual ranges to lock the set for engine braking. For the 4.0L, Ford gave the 4R55E a larger overdrive drum and more clutch capacity than the 4R44E, which is exactly why the drum is model-specific.
Valve body problems fake this failure. Sonnax lists coast clutch valve leakage as a cause of lost fourth and lost engine braking, and EPC circuit trouble as a cause of broken bands and blown servo seals. Rule those out with a gauge using our line pressure guide, and compare against a shift-feel diagnosis in shift flare vs slip: a flare that only shows up on the 3-4 shift with good pressure points at the band and drum. A weak 4R55E EPC solenoid is worth testing before the transmission comes out.
The 4R55E was used with the 4.0L V6 in the 1995-1996 Explorer and the 4.0L Ranger of the same period, and was replaced by the 5R55E during the 1997 model year. This set comes from the shared 4R44E, 4R55E, 5R44E and 5R55E parts pool, but sizes changed between the light-duty and 4.0L units and between the four- and five-speed versions. Lay your old drum and planetary next to the photo and match them, or send us your year and VIN to confirm. Related 4R55E planetary parts are listed separately.
Inspect the drum bushing and the sealing ring lands, install new coast clutch plates and piston seals, air-check the coast clutch, and set clearance to spec. Replace the overdrive band while you are there; the 4R55E master rebuild kit for 1995-1996 includes the soft parts. If the old drum failed from heat, flush the cooler before the new parts see fluid. Refill with MERCON V, checking the level hot with the engine running.
| Fits | 4R55E |
| Part type | Input Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
The 4.0L V6 Explorer and Ranger in the 1995-1996 period. Ford replaced it with the 5-speed 5R55E during the 1997 model year.
No. The 4R55E got a larger overdrive drum and more clutch capacity for the 4.0L. Match your old drum to the photo or send your year and VIN.
The overdrive drum and overdrive planetary assembly shown in the photo: drum, carrier, sun gear and ring gear with shaft. Nothing else is included.
Yes. Coast clutch valve leakage can cause lost fourth and no engine braking, and EPC circuit faults can break bands. Check line pressure first.
Overdrive band, coast clutch frictions and steels, piston seals and sealing rings, and flush the cooler if the old parts failed from heat.
