4R70W Pump 1994-2004, new and ready to install. Fits the 4R70W. Ships fast from the USA.
This is a new front pump for the Ford 4R70W listed for 1994 through 2004, the long middle stretch of the transmission's life behind V8s in the F-150, Expedition, Navigator, Crown Victoria, Grand Marquis, Town Car and Mustang. Owners usually land here after the truck starts hesitating before it drops into gear, slips once the fluid is hot, or develops a whine that climbs with engine speed even in Park. Those are classic signs that the pump can no longer keep up, and this unit comes new, with a 1-year warranty, so the oil supply for the whole transmission starts from fresh parts.
The 4R70W pump is a gear-type pump bolted to the front of the case. The torque converter hub rides in the pump bushing and spins the inner gear, which drives the outer gear inside the pump body. All line pressure, converter charge oil, cooler flow and lubrication begins at that gear set. The stator support is bolted to the pump body and carries the forward clutch feed through its sealing ring lands, so the pump assembly is also part of the forward clutch circuit, not just a fluid source.
Two wear points matter most. The first is the bushing: Sonnax notes the factory bushing is machined in place, and typical drop-in replacements are not thick enough, which leaves extra hub clearance, a leaking front seal, noise and lower pump volume. The second is the gear pockets. Once clearances grow, output falls off at idle and low speed, which is why these transmissions get lazy on hot stop-and-go driving first.
Scan for codes first. EPC solenoid and shift solenoid faults are among the most common 4R70W failures and can mimic a weak pump. Then put a pressure gauge on the line port: low pressure at idle in both Drive and Reverse points toward the pump, while good idle pressure that will not rise with throttle points toward the pressure regulator valve and its bore. Our 4R70W and 4R75W problems guide explains that test and the cross-leak failures that feel like slipping, and the F-150 4R70W problems guide covers how the same issues show up in a truck.
This pump is listed for 1994-2004 4R70W transmissions, and that last year matters. ATRA's interchange notes explain that the 2004-up pump body is the same as the earlier one except for the intermediate piston: the late design uses a larger bonded rubber piston with a wave return spring on 2004-2005 units, while earlier units use an aluminum piston. The two styles can be swapped only as a complete pump assembly, and a wave spring going into an early case needs its seat installed or it will wear into the aluminum. Before ordering, pull your old pump and check which intermediate piston it has, compare the bolt pattern and stator support, and read the transmission code on the door sticker. If you are unsure, send us your year and VIN. If your unit is clearly a late one, compare the 4R70W pump for 2004-2008; every pump range we stock is on the 4R70W parts page.
If a valve body cross-leak was part of the complaint, replace that at the same time; our 4R70W valve body is listed for the late units.
| Fits | 4R70W 1994-2004 |
| Part type | Pump |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed through 2004, but 2004 is when Ford moved to a bonded rubber intermediate piston in the pump. Check which piston your old pump has. Early and late pumps swap only as complete assemblies, and a wave spring in an early case needs its seat.
Use a pressure gauge. Low pressure at idle in Drive and Reverse, plus noise, points at the pump. Normal idle pressure with no rise under throttle points at the pressure regulator valve, its bore or the EPC solenoid.
MERCON V. Ford lists about 13.9 quarts dry fill for the Crown Victoria 4R70W, but a pump swap only needs the pan and converter refilled; set the final level hot with the dipstick.
A front seal, pump gasket and O-ring, stator support sealing rings if worn, and an inspection of the converter hub. If debris came out of the pan, overhaul the unit and flush the cooler.
No special relearn is needed for the pump itself. Clear any stored codes and road test so the computer can adapt to the restored line pressure.
