5R55W Solenoid Kit 2001, remanufactured and ready to install. Fits the 5R55W. Ships fast from the USA.
This is a remanufactured solenoid block for the 5R55W and 5R55S five-speed automatic. It is the part to look at when a 2002-or-later Ford Explorer, Mercury Mountaineer or Explorer Sport Trac with the 4.0L or 4.6L starts flaring on the 2-3 shift, banging into gear, or going into limp mode with shift solenoid or pressure control codes. The listing gives Ford number 9L2Z-7G391-AA, cross-references D46420B and 58879WD, and includes the solenoid block and screen. The listing says it fits 2001 and up, but the 5R55W did not appear in the Explorer until 2002, so read the fitment notes below before you order.
On the 5R55W and 5R55S, every solenoid lives in one assembly bolted under the valve body. Ford's service information lists four on/off shift solenoids (SSA, SSB, SSC and SSD), a TCC solenoid and three pressure control solenoids (PC-A, PC-B and PC-C). The shift solenoids are normally open three-way valves that pick the gear. The PC solenoids are variable force units that set clutch and band apply pressure. That is why a worn block causes more than codes. It also makes shifts flare, harden or happen late, because the pressure the computer asks for is not what the clutches get.
Scan for codes and note which solenoid each one names. Unplug the 16-pin case connector, look for fluid in the pins, and measure each circuit. In Ford's diagnostic chart, SSA through SSD should read 16-45 ohms and the TCC solenoid 9-16 ohms. If a reading is out of range or a circuit is open or shorted, the block is bad. If every solenoid tests good but the unit still slips, the case may be the problem. Servo pin bore wear is a well-known 5R55W/S failure. See our servo pin bore wear guide and the 5R55 harsh shift walkthrough before you spend money on a block.
The listing names the 5R55W and 5R55S in 2002-and-later Explorer, Mountaineer and Sport Trac with the 4.0L and 4.6L, and also mentions the Lincoln Aviator, Lincoln LS and Thunderbird. According to Sonnax, the W was used in 2002-2003 Explorers and Mountaineers, and the S took over in 2004-2005. The 2000-2002 Lincoln LS and the 2002 Thunderbird used the 5R55N, which has a different base plate and circuits, so this block is not a match for an N unit. ATRA's bulletin adds that 2002-2003 Ford units used the early pack, 1L2Z-7G391-AG, while 2004-on units use the 4L2Z design, which was updated to the 9L2Z number on this listing. If your truck is a 2002 or 2003, read the number on your old block and send it to us with your VIN before you order. You can find the rest of our parts for this family on the 5R55 parts page.
| Fits | 5R55W 2001 |
| Part type | Solenoid Kit |
| 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.
Not in practice. The listing says 2001 and up, but Sonnax dates the 5R55W in the Explorer and Mountaineer from 2002, so a 2001 Explorer has a different transmission. This block is for 2002-and-later Explorer, Mountaineer and Sport Trac with the 5R55W or 5R55S.
Those years originally used the early pack, 1L2Z-7G391-AG, while this block carries the updated 9L2Z number. Read the number on your old block and send it with your VIN, and we will confirm the match before it ships.
The listing includes the solenoid block and screen. Ford's design puts all of the solenoids in this one assembly: four shift solenoids, the TCC solenoid and three pressure control solenoids.
Sonnax notes that the variable force solenoids can lose their fluid prime during handling. Prime the circuits with Mercon V before installing. If shifts are still off, run the truck until it is hot, let it cool, and drive it again after the relearn.
Use Mercon V. Torque the eight block bolts to 71 lb-in (8 Nm) in sequence, check the level hot at the T30 fill plug, then clear the codes and reset the adaptive learning.
