5R55S Planetary 1999, used and ready to install. Fits the 5R55S. Ships fast from the USA.
This is a used, genuine Ford front planetary carrier for the 5R55W and 5R55S, supplied with its ring gear and bearing. It was pulled from a 2002 Ford Explorer, the first year the 5R55W went into the Explorer and Mountaineer. It suits a budget rebuild where only the front planetary is damaged: a growl that tracks road speed, chipped pinions found at teardown, or a carrier that was overheated when a lube problem took out the gear train ahead of it. Because it is an original Ford part rather than an aftermarket copy, the pinion and ring gear fit match what the factory built.
A 5R55 uses more than one planetary set to make five forward speeds and reverse. Each carrier holds a group of pinions that mesh with a sun gear on the inside and a ring gear on the outside. Clutches and bands hold or drive one member of each set, and the combination decides the ratio. Supplying the ring gear and bearing with the carrier matters here, because the ring gear teeth wear in with the pinions. Putting a fresh carrier into a pitted old ring gear brings the noise right back.
Keep in mind that most 5R55W/S slipping, along with codes such as P0735, comes from wear in the servo pin bores rather than from the gear train. Wayne Colonna of ATSG also points out that this family loses planetaries to poor lubrication, fed by the pump and the cooler bypass/thermal valve. If you replace the gears without checking that circuit, expect a repeat.
A gear-train noise is present under load and on coast and changes with each shift; a pump whine follows engine rpm instead. Work through the 5R55W whine and clunk diagnosis first. If the truck just will not move, the no-movement diagnosis guide covers the forward clutch, the pump and the low fluid causes you should eliminate before you split the case.
The part was offered as fitting the 5R55W and 5R55S, 1999 and up, and was removed from a 2002 Explorer. Treat the 1999 date carefully. Sonnax places the 5R55N in 1999-2002 Jaguar S-Type, Lincoln LS and Thunderbird, and says only a few N parts interchange with a W or S. The W ran in 2002-2003 Explorer and Mountaineer, and the S took over in 2004-2005 Explorers and in 2003-and-later Lincoln LS and Thunderbird. Sonnax also notes that W and S hard parts vary, including the 24-tooth versus 38-tooth overdrive sun gear. Lay your old carrier next to the photo, compare the pinion count, spline count and ring gear, or send us your year and VIN. Other options for this family are on the 5R55 parts page, including the remanufactured 5R55S/W overdrive planet kit.
| Fits | 5R55S 1999 |
| Part type | Planetary |
| Condition | Used |
| 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.
Not reliably. Those years used the 5R55N, and Sonnax notes only a few N parts interchange with a W or S. This carrier came out of a 2002 Explorer 5R55W, so match it against your old part or send your VIN first.
Yes. It is supplied with the ring gear and a bearing, so you are not pairing a different carrier with a worn ring gear.
Used, genuine Ford. Inspect and clean it, check pinion end play, and replace the thrust washers and bearings before installing.
Probably not first. In the 5R55W and 5R55S that pattern most often comes from servo pin bore wear. Confirm gear-train damage with a pan inspection and a noise check before buying hard parts.
Mercon V, checked through the level plug since there is no dipstick. Clear adaptives and road test afterward.
