4R70W Shift Kit 2001, remanufactured and ready to install. Fits the 4R70W. Ships fast from the USA.
If your 2001 F-150, Expedition, Crown Victoria, Grand Marquis, Mustang or Town Car has gone soft on the shifts, slips under load, will not lock the converter, or came back from a rebuild and burned the clutches again, a shift kit is only part of the answer. This 2001 listing is the more complete one: a remanufactured 4R70W valve body for the 2001 casting, with the solenoids included and the valve updates already installed, tested on a valve body test stand before it ships. You remove the old assembly and bolt this one in, instead of drilling and re-springing the original on your bench.
2001 is the first year of the late-style 4R70W valve body. Through 2000, a two-bolt stiffener plate under the 2-3 accumulator clamped the separator plate and gasket against the casting. Starting with 2001 that plate was deleted, the 2-3 accumulator retainer now sits directly on the separator plate, and the capacity modulator valve was removed with its bore cast closed. Sonnax documented the result: with no clamping in that area, forward clutch oil can push the separator plate up and cross-leak into the direct clutch circuit. Cracked separator plates found on 2001-up teardowns are a sign of that leak, and the real damage is a dragging direct clutch. That is why a 2001 valve body is not interchangeable with a 1998-2000 unit even though both use the hard-wire connector.
The build sheet for this unit lists an updated pressure regulator valve, updated boost valve, updated TCC sleeve and the 4th boost update, with other updates done as needed. The pressure regulator and boost valve set line pressure and how quickly it climbs with throttle, so worn bores there show up as soft shifts and slipping. The TCC sleeve controls converter clutch apply and release, which is where lockup slip and shudder come from. Those are the same complaints shift kits are bought to cure, fixed at the source.
Scan for codes and test the solenoids before condemning hydraulics; a bad solenoid or connector can feel just like a worn valve body. Our 4R70W shift solenoid symptoms guide covers the electrical checks, and the vehicle-specific 4R70W F-150 shift problems guide and Crown Victoria shift problems guide cover the failures each platform sees most. When the wiring is good and the shifts still slip, flare or refuse to lock up, the valve body is the repair. If you find burnt direct clutch plates, ask us whether this unit has the separator plate clamp fix (Sonnax sells it as retainer plate kit 76507F-01K) before you install it.
This listing is for the 2001 4R70W with the late valve body casting and the black hard-wire case connector. It is not the correct part for 1993-1997 soft-wire units or 1998-2000 units that still use the stiffener plate. Compare your old valve body against the photos, or send your year, model and VIN and we will confirm the match. Everything else for this transmission is in the 4R70W parts collection.
If clutches are already burnt, pair this unit with the 1996-2003 4R70W master rebuild kit, and on a tow vehicle add the 1998-2002 4R70W transmission cooler to keep fluid temperature down.
| Fits | 4R70W 2001 |
| Part type | Shift Kit |
| Condition | Remanufactured |
| 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.
Not as a direct swap. 2001 is the first year without the two-bolt 2-3 accumulator stiffener plate, and the capacity modulator valve bore is cast closed, so the 2001 casting differs from the 1998-2000 unit even though both use the hard-wire connector.
It is a complete remanufactured valve body with solenoids included. The pressure regulator valve, boost valve, TCC sleeve and 4th boost are updated and the unit is tested before shipping, so there is no kit to install.
With the stiffener plate gone, nothing clamps the separator plate near the 2-3 accumulator. Forward clutch oil can bow the plate and cross-leak into the direct clutch circuit. The crack is a symptom; the dragging direct clutch is the real damage.
MERCON V. Replace the filter and pan gasket at the same time and check the level hot with the engine running in park.
Clear keep-alive memory with a scan tool or a battery disconnect, then drive through several normal shift cycles so the computer adapts to the new valve body.
Only if the slip comes from low pressure. If the clutches or bands are burnt, they must be replaced; a new valve body stops the cause but cannot restore damaged friction material.
