5R55S Valve Body 2002-2008, remanufactured and ready to install. Fits the 5R55S. Ships fast from the USA.
If your 2002-2008 V8 Explorer, Mountaineer or Mustang is shifting harsh, flaring between gears, or shuddering under light throttle, the 5R55S valve body is the first place to look. The 5R55S is Ford's firmer, sport-tuned version of the 5R55 family - built for higher-output V8 applications where the shift feel is deliberately quicker and more aggressive than the smoother-tuned 5R55W it shares most of its architecture with.
Unlike the simpler on/off-solenoid 5R55E, the 5R55S valve body carries four on/off shift solenoids, one PWM torque converter clutch solenoid, and three variable force solenoids (VFS) that modulate pressure smoothly rather than just switching it on and off. Those variable force solenoids are what let the S tune shift firmer and faster than the W - they are commanded at roughly 0.5 amp by the PCM and control the reverse and forward engagement valves along with line pressure. When the bores those solenoids feed wear, or the separator plate between the solenoid body and the casting degrades, that fine pressure control falls apart and the firm factory shift turns into a harsh bang or an unpredictable flare.
Pull codes and check fluid level and condition before replacing anything. Our 5R55 harsh or delayed shifts diagnostic walkthrough covers how servo bore wear and separator plate wear show up on a scan tool and in pressure readings, so you can rule out a cheaper fluid or solenoid-pack fix before committing to a full valve body.
This valve body fits the 5R55S as built from 2002 through 2008. Ford revised the solenoid pack during this production run, moving from an earlier part number to an updated one partway through, so match your casting, connector, and solenoid pack against the unit you are removing, or send us your year and VIN to confirm before ordering. See our full 5R55 parts collection for the W-variant valve body, solenoid kits, and rebuild kits we stock alongside this one, and compare against the standard 5R55S valve body listing if your application falls outside the 2002-2008 window.
Drop the pan and change the fluid and filter at the same time as the valve body so metal or clutch debris from the old unit does not circulate through the new one. This family runs on Mercon V ATF. Torque the eight solenoid body bolts to the Ford-specified 71 lb-in (8 Nm) in the correct sequence - overtorquing here is a documented cause of a fresh valve body warping and leaking right after install. Run the PCM's adaptive relearn once the transmission is back together, and if the sprag clutch is original, replace it while the unit is open; see our 5R55S sprag clutch for that part.
| Fits | 5R55S 2002-2008 |
| Part type | Valve Body |
| 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.
They share the same four on/off shift solenoid, one PWM TCC solenoid, three variable-force-solenoid architecture, but the S is tuned for a firmer, quicker shift feel in sport and higher-output V8 applications, while the W is tuned smoother for luxury and standard-duty use. The castings and solenoid tuning are not interchangeable between them.
Ford updated the solenoid pack part number partway through this production run. Matching your existing pack and casting, or giving us your year and VIN, avoids ordering a valve body built for the wrong revision.
Mercon V ATF, both for the fluid change done alongside the valve body install and for any later top-off.
71 lb-in (8 Nm) in the Ford-specified sequence. Overtorquing these bolts is a documented cause of a new valve body warping and leaking soon after install.
Yes - run the PCM's adaptive shift relearn after reassembly so the computer stops compensating for the old unit's wear and shifts correctly against the new valve body.
If it is original, yes - it is a known wear point on the 5R55 family and far cheaper to swap now than to open the transmission again later just for that part.
