4R55E Shift Kit 1994-2007, new and ready to install. Fits the 4R55E. Ships fast from the USA.
If your 4.0L Explorer, Ranger or Mazda B4000 slides through the 2-3 upshift when you lean on it, has already eaten a forward clutch or an overdrive band, or sometimes refuses to move at all, this is the kit most rebuilders reach for. It is the TransGo SK 44-55E, the valve body repair kit TransGo catalogs for every 4R44E, 4R55E, 5R44E and 5R55E from 1994 on. It goes in through the pan, so the transmission stays in the truck, and it raises shift firmness at the source instead of just masking a symptom.
The 4R55E is the heavy-duty electronic four-speed that grew out of the A4LD, and it was paired with the 4.0L V6, the engine that tows and hauls in these trucks. TransGo's own instructions explain why the factory calibration hurts it: clutch and band apply pressure is regulated as low as about 40 psi even when line pressure is much higher. That low apply pressure lets the forward clutch, the 2nd band and the overdrive band slip on every shift, which is where the burned-friction smell and the 2-3 cut-loose come from. A stuck EPC solenoid on a stock valve body can also leave the truck with no forward or reverse.
The kit changes the forward circuit so a truck with a failed EPC solenoid can still be driven in for service, firms up both shift feel and converter lockup, and lets you pick the firmness: the red forward-control spring for standard use, orange for firmer, or orange with the yellow inner spring for the firmest setting. It adds a new EPC limit valve assembly, a tapered orifice for the 2nd band feed, new high-temperature clutch rings, upgraded center support sealing rings and a center support shim.
Pull codes and measure resistance at the case connector first. TransGo lists the shift solenoids at 22 to 48 ohms, TCC at 9 to 16 and EPC at 3.1 to 5.7, and our guide on testing a transmission solenoid with a multimeter shows the method. Then put a gauge on the line pressure tap using our line pressure checking guide. If the solenoids test good, pressure comes up, and the truck still flares, the kit is the right next step. If the fluid is black and the frictions are gone, the kit belongs inside a rebuild, not instead of one.
Listed for the 4R55E 1994-2007. TransGo's application covers the 4R44E, 4R55E, 5R44E and 5R55E from 1994 on, so the same kit also suits the five-speed that replaced the 4R55E during 1997. Ford switched from the hydraulic A4LD to these electronic units for 1995, so a 1994 truck is almost certainly an A4LD and needs a different kit. Look for the PR vent and plate holes TransGo calls out before drilling, and send your year and VIN if you are unsure which unit you have.
| Fits | 4R55E 1994-2007 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
No. TransGo states installation does not require removing the transmission. The work is done at the valve body through the pan opening, though the band adjustment and center support shim steps are best done during an overhaul.
It is built for exactly that complaint when the cause is low apply pressure. TransGo also notes that a worn SS2 solenoid can cause a 2-3 flare, so test the solenoids before you assume the hydraulics are at fault.
Yes. TransGo's SK 44-55E covers the 4R44E, 4R55E, 5R44E and 5R55E. The 5R valve body has an extra shift solenoid, and the instructions show both layouts.
With the red spring the shifts are firm but streetable. The orange spring makes them firmer and also firms the 3-2 coast downshift, and orange with the yellow inner spring is the firmest setting.
Refill with MERCON V, the current Ford specification for this transmission family, and check the level hot at idle. TransGo notes the cooler flow is temperature controlled, so check cooler flow only once the truck is warm.
