5R55W Shift Kit, new and ready to install. Fits the 5R55W. Ships fast from the USA.
If your Explorer, Mountaineer, Mustang V6 or Lincoln LS with the 5-speed 5R55W or 5R55S is flaring on the 2-3 or 4-5 shift, groaning from the pump, or slipping in lockup, this TransGo kit is the valve body side of the repair. It is a new TransGo kit in the Reprogramming Kit box, the hydraulic package rebuilders use when they want the 5R55W to shift firmer and survive towing and heavy throttle better than the factory calibration.
The 5R55W and 5R55S use two bands, intermediate and overdrive, alongside their clutch packs, and every shift involving those bands depends on how fast the servos fill. TransGo states that its 5R55W/S reprogramming kit raises intermediate and overdrive band apply pressure to shorten shift times under heavy throttle, which is exactly where a stock unit lets the band slip and glaze. The kit also replaces wear-prone hardware that causes problems you might not think of as shift-kit territory.
A ratio code on a 5R55W is not automatically a valve body fault. The most common hard failure in this family is wear in the overdrive and intermediate servo pin bores in the case itself, which bleeds apply oil away and burns the bands no matter how good the valve body is. Read our 5R55W/5R55S servo pin bore wear guide before you order anything, and use the 5R55 harsh or delayed shift walkthrough to separate solenoid pack, pressure and engagement faults. If your main complaint is a P1744 or lockup shudder, work through our 5R55W P1744 diagnosis first, because a worn TCC modulator bore and a failing converter clutch can look alike on a scan tool.
TransGo lists its 5R55W/S reprogramming kit for the 5R55W and 5R55S from 2002 on, and its basic SK 5R55W shift kit for the 5R55W, 5R55S and 5R55N from 1999 on. That covers the 2002-2010 Explorer and Mountaineer 5R55W and the 5R55S in the Mustang V6, Lincoln LS, Thunderbird and 2006-2010 Explorer V6. The early 5R55N used in early Lincoln LS and Thunderbird applications differs internally, so if you have a 1999-2001 unit, compare against the packaging photo and your valve body, or send us your year and VIN before ordering. This is not the kit for the older 5R55E in the Ranger and early Explorer, which is a different transmission. Browse every 5R55 part we carry on the 5R55 transmission page.
This is a valve body job, so plan to drop the pan, remove the solenoid pack and pull the valve body, and in most cases the pump, since the flow control valve and direct clutch rings live there. Follow the TransGo instruction sheet in order, keep removed valves and springs laid out as they came out, and use the supplied reamers only on clean, flushed castings. When reinstalling the solenoid body, Ford service information calls for its bolts at 71 lb-in (8 Nm) in sequence; overtightening damages the solenoid housing. Refill with Mercon V only. A dry 5R55W/S takes roughly 11.2 quarts behind the 3.0L and 3.9L and 12.4 to 12.7 quarts behind the 4.0L and 4.6L, but always set the final level hot at the check plug.
Fit a new 5R55W/5R55S filter and pan gasket kit with the shift kit. If the bands or clutches are already burnt, pair the kit with a 5R55W overhaul kit rather than reprogramming a worn unit, and if the valve body bores are past saving, a replacement 5R55W valve body is the faster route. After the install, clear codes and let the PCM relearn shift adapts over several drive cycles before judging shift feel.
| Fits | 5R55W |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 2002-2010 Explorer and Mountaineer with the 5-speed automatic use the 5R55W, which TransGo lists for this kit from 2002 on. If your Explorer has the 4R70W four-speed or a later 6-speed, it will not fit. Send us the year and VIN if you are unsure which transmission you have.
No. Servo pin bore wear is in the case, not the valve body. If the bores are worn oval, apply oil leaks away and the bands keep burning even with a new kit. Check the bores and repair them with a sleeve kit or case before installing the shift kit.
The valve body work can be done in the vehicle, but this kit also includes a pump flow control valve and direct clutch rings, which require the pump and the unit apart. Most installers fit it during a rebuild.
Mercon V automatic transmission fluid. Set the level hot at the fill and check plug rather than trusting the dry capacity numbers.
Shifts will be noticeably firmer, especially under heavy throttle, because band apply pressure is raised. Light-throttle shifts stay civil once the PCM has relearned its adaptive values over a few drive cycles.
