4R100 Planetary, remanufactured and ready to install. Fits the 4R100. Ships fast from the USA.
Super Duty and Excursion owners who tow with a 7.3L Power Stroke, 5.4L or 6.8L V10 usually find a bad planetary the same way: a whine that follows road speed, an overdrive that slips or disappears after a hot pull, or metal on the magnet at the next pan drop. This remanufactured planetary is listed for the Ford 4R100, the heavy-duty four-speed that replaced the E4OD for 1998 and ran behind Super Duty pickups, the Excursion and E-Series vans. A reman carrier has already been inspected and set up, which matters in a unit that sees as much torque and heat as this one.
Ford kept the E4OD gear train when it created the 4R100, so the ratios did not change: 2.71 first, 1.54 second, 1.00 third, 0.71 overdrive and 2.18 Reverse. There are three gearsets. The overdrive planetary sits at the front, behind the pump and coast clutch drum. The rear half is a Simpson-type train, where a forward set and a reverse set share one sun gear. The ATRA application chart shows how the overdrive set is controlled: its one-way clutch holds it at 1:1 in Drive 1st through 3rd, the coast clutch locks the overdrive sun gear for Reverse, manual ranges and engine braking, and the overdrive clutch holds that sun gear for 4th.
What the 4R100 changed was the hardware around the gears. The pump moved to a common F81P casting, the coast clutch drum went from cast iron to stamped steel, and a PTO-capable case became available. Those changes added capacity, but the planetary carriers still rely on a steady flow of lube oil. Sonnax lists the OE plastic front lube/drainback valve in both E4OD and 4R100 units as a part that can melt at high fluid temperature, which restricts front lube oil and leads to overdrive planetary failure.
A 4R100 that will not use 4th is not always mechanical. EPC and shift solenoid faults can cause harsh shifts, missing gears or failsafe operation, so scan for codes and check the solenoid pack first. Our EPC solenoid symptoms guide shows what pressure faults feel like. If the electrical side checks out, drop the pan and read the debris. Friction material alone points at clutches. Needles, bronze washer material or tooth fragments point at a gearset. On the bench, check every pinion for roughness and end play. The E4OD and 4R100 common problems guide covers the overheated overdrive pattern.
This listing is for the 4R100, which Ford used from 1998 onward in Super Duty pickups, the Excursion and E-Series vans. The listing does not give a Ford part number or say whether this is the overdrive, forward or reverse gearset. Before installing, compare it with your old part for pinion count, hub spline count, ring gear teeth and stack height. PTO and non-PTO units also use different coast clutch drums, so check the parts that sit next to the planetary as well. If in doubt, send us your year and VIN. Our 4R100 vs E4OD guide lists the 1998 changes, and the E4OD and 4R100 parts collection carries the rest of the hard parts.
| Fits | 4R100 |
| Part type | Planetary |
| 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.
It is listed for the 4R100, which was used behind the 7.3L, 5.4L and 6.8L in 1998-up Super Duty trucks. Confirm the gearset position and dimensions against your old part, or send us your VIN.
The gear ratios are identical and the gear train is shared, but Ford changed the pump, coast clutch drum and other parts in 1998. Compare the old part before assuming interchange.
High heat can melt the plastic front lube/drainback valve and starve the overdrive planetary of oil. A slipping overdrive clutch or a solenoid fault can also cause it, so check codes first.
Use MERCON V ATF. Check the level with the fluid at normal operating temperature, engine idling in Park, and top up through the dipstick tube.
Thrust washers and bearings, a filter, a full seal and gasket kit and, if the old set burnt, a melt-proof front lube/drainback valve. Flush the cooler so debris does not return.
