4R70W Valve Body 2004, remanufactured and ready to install. Fits the 4R70W. Ships fast from the USA.
This is a Sonnax remanufactured valve body listed for the 2004 Ford 4R70W. If your 2004 Mustang, Crown Victoria, Grand Marquis, Town Car, Expedition or Heritage-body F-150 has started slamming into Reverse, slipping on the highway once it is warm, flaring between gears, or throwing EPC and shift solenoid codes, this is the part that most often brings the shift quality back without pulling the transmission out of the vehicle.
A 2004 4R70W sits in the middle of the lead frame generation. The solenoids clip into a molded plastic lead frame instead of the loose wires used on 1996-97 units, and the casting is the post-2001 version without the factory stiffener plate over the 2-3 accumulator. Inside, the main pressure regulator valve sets line pressure based on the signal from the EPC solenoid, the shift valves route that pressure to the forward clutch, intermediate band, direct clutch and overdrive band, and the converter clutch circuit controls lockup. Because Sonnax specializes in rebuilding exactly these circuits, a Sonnax remanufactured unit is built with attention to the pressure regulator and boost valve bores that wear first in this family.
Sonnax documents oscillation wear on the original boost valve in this family, which causes poor line rise in Reverse, a delayed or slipping Reverse and eventually a burned reverse clutch. Pressure regulator bore wear produces the related hot-slip complaint in forward gears. Both show up on a line pressure gauge, so measure Park, Drive and Reverse pressures cold and hot before spending money. Our 4R70W valve body wear and bench fix guide lays out which bore causes which symptom, and Crown Victoria and Grand Marquis owners will find model-specific complaints in the Crown Victoria common problems guide.
This listing is for 2004 4R70W applications only. 2004 is a tricky year for Ford rear-drive automatics: the redesigned 2004 F-150 and several other models moved to the 4R75E or 4R75W, while others kept the 4R70W, and we carry those versions separately. Check the transmission ID tag on the case, compare your casting and solenoid lead frame connector with the photos, or send us the year and VIN and we will confirm before it ships. For a wider year range, see the 4R70W valve body 2004-2011, and browse every version on the 4R70W collection page.
If you found worn internal parts while the pan was down, the 4R70W internal wiring harness is worth replacing at the same time on a 2004, since a cracked lead frame produces the same solenoid codes as a bad valve body.
| Fits | 4R70W 2004 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | Sonnax |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 4R70W was used in 2004 rear-drive Fords such as the Mustang and Panther-platform cars, but several 2004 trucks and cars moved to the 4R75E or 4R75W. Check the transmission tag or send us your VIN to confirm you have a 4R70W.
A worn boost valve in the pressure regulator circuit is a common cause. It prevents line pressure from rising enough in Reverse, which leads to a delayed or slipping engagement and can burn the reverse clutch if left alone.
Yes. A remanufactured unit has been disassembled, cleaned, inspected and repaired, with worn bores addressed, and is tested before it ships. A used valve body carries whatever wear the donor transmission had.
Mercon V automatic transmission fluid. Check the level hot in Park once the new valve body is installed and the transmission has cycled through every gear.
They can. The 1998-2008 internal harness is a molded lead frame that can crack and short, producing solenoid codes that mimic valve body failure. Inspect it and test solenoid resistance at the case connector before ordering.
Yes. Reset the adaptive shift memory with a scan tool, or by disconnecting the battery, then drive with light and moderate throttle through every upshift so the computer adjusts to the new valve body.
