5R55W Shift Kit 1999, new and ready to install. Fits the 5R55W. Ships fast from the USA.
The classic 5R55W complaint goes like this: the Explorer or Mountaineer drives fine cold, then after twenty minutes it sits in Drive with the engine revving and goes nowhere, or it takes several seconds to pick up forward. Often there is a whine from the front of the transmission that rises with engine speed. This new TransGo SK 5R55W shift kit is sold under a 1999 listing title, and its pump-side parts are aimed squarely at that won't-move and pump-noise failure, with valve body parts for the lockup and shift-quality problems that usually come with it.
The heart of the no-move fix is the pump flow control assembly. TransGo's instructions explain that the original flow control valve sticks, which causes the won't-move condition, and wears out, which leads to burned frictions and noise. Ford does not sell that valve on its own; it only comes inside a new pump. The kit supplies an upgraded piston, bushing, yellow spring and wire retainer, installed with the port holes facing the big open passage in the pump body. The rest of the kit covers:
A warm no-move can also be a burned forward clutch, a failed pump or low fluid, so rule those out first. Our 5R55W Explorer won't move guide walks the checks in order, and the 5R55W pump failure symptoms guide helps you decide whether the pump body itself is damaged. GEARS Magazine documented a 2006 Explorer whose delayed forward got worse when warm while every solenoid and sensor read normal; the only damage found was the forward clutch. That is why this kit is installed with the transmission apart and inspected, not as a substitute for a teardown. For grinding or clunking rather than a whine, see the 5R55W noise diagnosis guide.
The 1999 in this listing title comes from TransGo's catalog, which lists the SK 5R55W for the W, S and N from 1999 on. The 5R55W itself was introduced in the 2002 Explorer and Mountaineer, so any W you are working on is 2002 or newer. The kit is the same SK 5R55W, interchange T54165B, that covers those trucks, and it includes separate instructions for the N valve body with a bottom plate. Send us your year and VIN if you are not sure whether you have the W, S or N. Browse every part for this family in our 5R55 transmission collection.
TransGo states the kit is for experienced professional transmission mechanics only. Two checks in the sheet are easy to skip and expensive to miss. First, with the direct clutch rings removed, look for cracks along the edge of the center support's metal sleeve where it runs under the bearing; replace the support if you find any, since overheating makes this more likely. Second, if the unit came in with delayed forward or burned direct clutches, clean the lube orifice cup plug and the passage on the edge of the stator to prevent repeated overdrive planet meltdown. Torque the pump bolts to 18 ft-lb after alignment and fill with Mercon V; an overfull W will burp fluid into the bell housing. If the pump body is scored, replace it with our 5R55W front pump assembly, and pair the kit with the 5R55W overhaul kit for seals and gaskets.
| Fits | 5R55W 1999 |
| 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.
It replaces the most common hydraulic cause, the original pump flow control valve, which TransGo says sticks and causes a won't-move condition. A burned forward clutch or damaged pump still has to be repaired, so inspect those during the install.
Yes. The SK 5R55W covers the 5R55W used in the 2002 and later Explorer and Mountaineer. The 1999 in the title is the start of TransGo's catalog coverage, not a model year that used the W.
According to TransGo, Ford only supplies the flow control valve inside a complete new pump. This kit includes an upgraded flow control assembly so the pump can be repaired instead.
Plan on an overhaul kit for seals and gaskets, and new frictions if the direct or forward clutches are burned. Replace the center support if its sleeve is cracked, and the pump if the body is scored.
Use Mercon V. Check it level, engine running in Park, with the fluid warm at 80 to 120 degrees F, and fill until a steady stream runs from the check hole in the pan drain plug.
