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The 4R70W is the AOD family grown up: electronic shift control, a wide-ratio first gear and a stronger geartrain. The 4R75W and 4R75E that followed in the Panther cars and later F-150s kept the same case, pan and filter. That makes parts simple. The FT105-style filter and the 14-bolt pan cover nearly every unit built.
What makes the service go wrong is not part selection. It is a leftover O-ring, an overtightened pan, and a refill done with the wrong fluid.
What Is in a 4R70W Filter Kit
| Part | Notes |
|---|---|
| Filter | FT105 / F6AZ-7A098-A style. Pushes into the pump/valve body bore on an O-ring neck and is held by bolts. |
| Filter O-ring | Usually preinstalled on the new filter neck. The old one often stays stuck in the bore. |
| Pan gasket | Rubber with steel compression limiters is the one to want. Cork gaskets crush and leak on this pan. |
| Pan (optional) | Steel factory-style or finned aluminum with a magnetic drain plug. |
Our 4R70W / 4R75W / 4R75E FT105 filter and gasket kit is the straight service kit for when the pan itself is fine.
The Stuck O-Ring Problem
When you pull the old filter, look at its neck. If the O-ring is not on it, it is still up in the bore. Install the new filter on top of it and the neck will not seat. The pump then pulls air past the seal, and you get a truck that moves fine cold, then whines, slips or loses drive when the fluid warms and thins out. It is the classic "it was fine before the fluid change" comeback.
Reach up with a pick or your finger and pull the old ring out before you install the new filter. Lube the new O-ring with clean ATF so it does not roll as it seats.
Steel or Aluminum Pan
The factory pan has no drain plug, so every service is a messy pan drop and you only exchange about a third of the total fluid. Pans also get bent from road debris or jack placement, and a dent pushed into the filter starves the pickup.
- Replace with steel if the rail is distorted or the pan is dented, and you just want factory fit back.
- Upgrade to aluminum if you tow, run a lot of stop-and-go, or want easy drain-and-fill services. The 4R70W aluminum pan kit with filter and magnet plug includes the filter and gasket, and the 265-813 finned aluminum pan replaces the pan alone.
- Check exhaust and crossmember clearance on Panther cars and 4WD F-150s before choosing a deep pan.
Pan bolts take light torque, roughly 10 to 12 lb-ft. Snug them in a crisscross pattern. The rubber gasket seals with very little clamp load, and cranking on it is what bends the rail.
Read the Pan Before You Clean It
- Gray paste on the magnet: normal.
- Brass flakes: bushing or thrust washer wear. Common on high-mileage units.
- Steel chips: look closely at the overdrive and reverse planetary area at teardown; hard parts are coming apart.
- Clutch material and dark, burnt fluid: worn friction packs or bands. A filter will not fix it.
Do the Solenoids While the Pan Is Down
The 4R70W solenoid body bolts to the valve body and is fully exposed once the pan and filter are off. If the truck has harsh 1-2 shifts, flare, no TCC lockup, or P0750 / P0755 / P1747 codes, that is the time to swap it rather than doing two pan drops. Solenoid bodies are year-specific, so match the year range: for 2005-2008 14-bolt pan units, the shift solenoid kit with filter covers both jobs. The 4R70W solenoid body guide covers the year breaks in detail.
Refill
Use Mercon V. Early units called for Mercon, but Mercon V is the accepted service fluid for the whole family today. A pan drop takes about 4 to 6 quarts. Add it, start the engine, run through the gears, and check level hot on level ground. Overfill causes foaming and fluid out the vent; underfill shows up as delayed engagement and whine.
4R70W / 4R75W Parts In Stock
Filter kits, steel and aluminum pans, solenoid bodies and master rebuild kits for the 4R70W family, shipped from the USA.
Shop 4R70W Parts → Hard Parts at Core Transmission PartsFAQ
Does the 4R75W use the same filter as the 4R70W?
Yes. The 4R70W, 4R75W and 4R75E share the same FT105-style filter and 14-bolt pan, so one kit covers the family.
Why does my 4R70W whine or slip after a filter change?
The most common cause is the old filter O-ring left stuck in the bore, which keeps the new filter from seating so the pump draws air. Drop the pan, remove the extra O-ring and reinstall the filter.
What fluid does a 4R70W take?
Mercon V is the service fluid. A pan drop and filter change takes roughly 4 to 6 quarts; check the level hot on level ground.
Is an aluminum pan worth it on a 4R70W?
For towing or if you want easy services, yes. It adds a drain plug so later services are a drain-and-fill, and the fins help with heat. If you just need to replace a damaged pan, a steel factory-style pan is fine.