5R55W Shift Kit 2002-2007, new and ready to install. Fits the 5R55W. Ships fast from the USA.
On a 2002-2007 Explorer or Mountaineer, the 5R55W usually announces trouble with a check engine light first: P0732 or P0735 for an incorrect gear ratio, sometimes P1740 for the converter clutch. Drive it and you feel a slide-bump on the 1-2, a flare on the 2-3, or a soft 4-5 that lets the engine flare before fifth catches. This listing is the new TransGo SK 5R55W shift kit for exactly those trucks, the hydraulic kit a shop installs while the valve body and pump are out so the rebuilt transmission does not return with the same codes.
The W in these trucks is electronically controlled: Transmission Digest describes four on/off shift solenoids, one PWM converter clutch solenoid and three variable force solenoids, all in one pack bolted to the valve body. The solenoids only send signal pressure; the valve body has to turn that into firm clutch and band apply. TransGo's kit works on that hydraulic side of the system:
On these years, two other faults set the same ratio codes. The first is the case: TransGo's sheet lists P0732, P0735 and a burned OD band right next to the overdrive servo pin check, and tells you to wiggle the pin while holding the servo. If it moves, the bore is worn and leaks apply oil, which our servo pin bore wear guide explains. The second is the solenoid pack. ATRA's seminar material splits these trucks into early packs (1L2Z-7G391-AG) and late packs (4L2Z-7G391-AA, later updated to 9L2Z-7G391-A), and notes the two differ by about 4 psi of control output at 0.6 amp, roughly 30 psi of mainline. A mismatched or failing pack can mimic a valve body problem. Work through the 5R55W Explorer shift problems guide and the 5R55W gear ratio code guide before ordering.
This kit is listed for the 5R55W from 2002 to 2007, which matches the W in the 2002 and later Ford Explorer and Mercury Mountaineer. It is the TransGo SK 5R55W, interchange T54165B, and TransGo's instructions cover the W, S and N, with the W and S sharing a valve body that has no bottom plate. Check that before starting, because the N page in the instructions is different. If your truck has been converted or you are unsure of the unit, send us the year and VIN. All parts for this family are in our 5R55 transmission collection.
TransGo says this kit is for experienced professional technicians only. Replace parts one bore at a time and keep the removed parts in order. When the solenoid pack goes back on, Ford's service information calls for eight bolts torqued to 71 lb-in in sequence, and warns that overtorquing damages the pack. Adjust the overdrive and intermediate bands snug with a short wrench, back off two turns and lock the nuts, and install both servo struts with the short side toward the valve body. Fill with Mercon V through the fill plug on the side of the case and check the level at 80 to 120 degrees F; fluid that only burps from the check hole means it is not full yet. If the original pack is the early type or shows intermittent codes, replace it with the updated 9L2Z-7G391-AA solenoid block pack, and if the valve body bores are worn, a 5R55W valve body for 2002-2008 is the better base for the kit.
| Fits | 5R55W 2002-2007 |
| 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.
Yes. It is listed for the 5R55W from 2002 to 2007, which covers the W in the Explorer and Mountaineer for those years. Check that the valve body has no bottom plate, which identifies the W/S design.
It addresses the valve body side of P0732 and P0735 complaints. If the overdrive servo pin is loose in the case, the bore is worn and must be repaired, or the code will return with the kit installed.
Not always, but test it. ATRA separates early and late packs on these years, and a mismatched or failing pack can change line pressure enough to cause shift complaints. The updated 9L2Z-7G391-AA pack is the current replacement.
Ford's service information calls for the eight solenoid body bolts at 71 lb-in (8 Nm) in sequence, and warns that overtorquing can damage the pack.
Mercon V. Fill through the plug on the side of the case and check with the engine running in Park and the fluid at 80 to 120 degrees F until a steady stream runs from the check hole.
