5R55E Shift Kit 1994-2007, new and ready to install. Fits the 5R55E. Ships fast from the USA.
If your 4.0L Ranger, Explorer or Mazda B4000 with the 5R55E five-speed lets the engine flare on the 2-3 shift when you push it, comes up on the intermediate band slowly, or has already cooked one forward clutch, the problem is often built into the factory valve body calibration rather than a single bad part. This listing is the new TransGo SK 44-55E, the valve body repair kit TransGo makes for the whole 4R44E, 4R55E, 5R44E and 5R55E family. It raises the apply pressure that clutches and bands see during a shift, so each shift finishes quickly instead of slipping and making heat.
On the stock 5R55E, line pressure can be high while the pressure actually sent to the clutches and bands during a shift is regulated as low as 40 psi. TransGo's instruction sheet calls that out as the reason these units burn forward clutches and bands. The kit replaces the forward control spring with a red spring and a new aluminum end plug for every model, and supplies orange and yellow springs for owners who want firmer shifts and a firmer 3-2 coast downshift. It also adds a converter relief and EPC limit assembly, a tapered orifice for the second band feed, high-temperature clutch rings, upgraded center support sealing rings and a center support shim. Converter lockup gets slightly firmer as a side effect.
There is a drivability change too. With the factory calibration, an EPC solenoid that sticks leaves the truck unable to move in forward or reverse. After the kit, the forward circuit is rerouted so the vehicle can still be driven somewhere for service.
A shift kit fixes pressure, not wiring. Pull codes first and measure the solenoids at the case connector. TransGo's specifications for this valve body are 22 to 48 ohms for each shift solenoid, 9 to 16 ohms for the converter clutch solenoid and 3.1 to 5.7 ohms for EPC. A truck that always starts in third is in limp mode, which is an electrical fault. TransGo also points out that a weak SS2 can cause a 2-3 flare on its own, so test it before you blame the hydraulics. If a solenoid reads out of range, the 5R44E/5R55E shift, EPC and TCC solenoid kit covers the set. Our 5R55 harsh or delayed shift walkthrough puts the pressure, electrical and mechanical checks in order.
This listing is titled 1994-2007, but the kit itself is not limited to those years. TransGo's product page lists it for all 4R44E, 4R55E, 5R44E and 5R55E units from 1994 on, and its instructions name the 2.3, 3.0 and 4.0 V6 Aerostar, Explorer and Ranger plus the Mazda B2300, B3000 and B4000. The Ranger Station's transmission chart shows the 5R55E behind the 4.0L in 1998-2011 Rangers, coded D on the door-jamb sticker. It does not fit the 5R55W, 5R55S or 5R55N used in later Explorers, Mustangs, the Lincoln LS and Thunderbird; those have a different valve body. Separator plates changed during production, so check whether your plate has the EPC limit hole before assembly. When in doubt, send us your year and VIN. Other parts for this family are on the 5R55 collection page.
TransGo states plainly that EPC solenoids wear out and recommends a new one with the kit. If your truck is a 2001-2005 Sport Trac or B4000 with converter clutch complaints, add the 5R55E TCC solenoid set for 2001-2005 while the pan is down.
| Fits | 5R55E 1994-2007 |
| 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.
If the transmission is a 5R55E or 5R44E, yes. The year range in the title is just how this listing was named. TransGo lists the SK 44-55E for all units in the family from 1994 on, and its instruction sheet names 1995-2010 builds.
No. Those transmissions use a different valve body and solenoid pack. They need a 5R55W/S specific kit, which you can find on our 5R55 collection page.
The valve body portion can be done in the truck with the pan and valve body down. The clutch rings, center support rings and shim only go in when the unit is apart for a rebuild.
With the standard red spring, shifts are firmer than stock but suited to daily driving. The orange spring, or orange and yellow together, make the shifts and the 3-2 coast downshift progressively firmer for towing.
Mercon V. Check the level hot, and verify cooler flow only after the transmission has warmed up.
