4R70W Expedition Fluid Change: Type, Capacity and Cost

A fluid change on a 1997-2004 Expedition looks like the easiest job in the shop: drop a pan, swap a filter, pour in red fluid. The questions that come with it are where people get into trouble. How often does Ford actually want it done? Why does only a third of the fluid come out? Is the bottle on the shelf the right MERCON? And why did the truck come back in second gear the day after? This guide answers those from Ford's own Expedition literature and a few bench cases. If the truck is already slipping or shifting wrong, read the Expedition slipping or Expedition shift problems guide first, because a fluid change will not fix worn hardware.

Recommended 4R70W parts

What this service actually takes: the FT105-type filter and pan gasket kit for the 14-bolt pan, and Motorcraft MERCON V by the case, enough for a pan drop plus top-off or most of a cooler-line exchange. Secure checkout on site.

4R70W 4R75W 4R75E Transmission Filter & Gasket Kit Ford FT105

$26.99View part

Motorcraft Mercon V ATF - Case of 12 Quarts (XT5QMC)

$173.99View part

Expedition 4R70W fluid specs at a glance

Start by confirming the transmission. Ford's 2002 Expedition owner guide lists two automatics for that truck, the 4R70W and the heavier 4R100, and they do not take the same fluid. The transmission code on the door-jamb label settles it before you open a jug.

Two notes on that table. First, Ford footnotes the capacity as "approximate dry-fill capacity" and says the amount can vary with cooler size and an in-tank cooler. The dipstick, not the number, sets the final level. Second, the XT-5-QM part number in the old guide has been superseded. Ford's current FCSD chemicals catalog sells Motorcraft MERCON V as XT-5-QMC (quart), XT-5-5Q3M (5-quart jug) and XT-5-DMC (55-gallon drum).

What Ford's maintenance schedule actually says

This is the part most owners and plenty of counter people get wrong, because Ford changed its answer during the 4R70W's run in the Expedition.

1998 Expedition Scheduled Maintenance Guide. The normal schedule lists "Change automatic transmission fluid" at 30,000 miles and at each 30,000-mile interval after that, with an exception only for the E4OD. The severe duty schedule moves it to every 21,000 miles (21k, 42k, 63k, 84k and so on). Ford defines severe duty as frequently towing or carrying heavy loads, sustained high speed in hot weather, short trips in humidity or freezing temperatures, dusty or sandy roads, and police, taxi or delivery use.

2003 Ford Universal Service Guide. By 2003 the normal schedule only calls for an ATF change every 30,000 miles on a short list of transmissions, the AX4S, 4F50N, 4F27E and the 4R100. Everything else, which includes the 4R70W, gets "inspect automatic transmission fluid level" at those intervals and a fluid and filter change at 150,000 miles. But the same guide's Special Operating Conditions page puts the 30,000-mile ATF change back for towing a trailer or using a camper or car-top carrier, extended idling and low-speed driving, dusty roads and off-road use.

Now think about how Expeditions get used. They tow boats and campers, they idle in school pickup lines, they carry seven people and a roof box to the beach. Very few of them live a true normal-schedule life. On the bench, the 4R70W units I see fail from fluid that has been cooked dark brown are almost always trucks that towed on the 150,000-mile normal interval. My rule for any Expedition is the special-conditions number: fluid and filter every 30,000 miles, and sooner if it tows heavy in summer.

Why a pan drop only gets a third of it

The 13.9-quart figure is a dry fill, meaning a transmission built on the bench with an empty converter, empty cooler and empty lines. A service drains only what sits in the pan. The stock 4R70W pan has no drain plug, so the fluid comes out when you loosen the bolts and tip the pan down. In my experience that is roughly 4 to 5 quarts with the filter out. The rest stays in the converter, the cooler and the lines, and in the clutch drums and valve body.

That leaves three practical choices:

• Single pan drop and filter. Replaces about a third of the fluid and the filter. Fine for a truck on schedule with fluid that still looks red.
• Two or three pan drains spaced a few hundred miles apart. Each one dilutes the old fluid further. Cheap, safe and slow. Change the filter on the first one only.
• Cooler-line exchange. After the pan and filter are done, disconnect the cooler return line, run the engine in Park, and pump new fluid in at the filler tube as fast as old fluid comes out the line. Stop when it runs clean red. Budget 12 to 16 quarts for this. Never let it run dry, and shut it down in under a minute between additions if you cannot keep up.

Some 4R70W converters have a drain plug you can reach through the inspection opening. Many do not. Do not drill one.

Step by step on the Expedition

1. Warm it up and lift it level. Warm fluid carries more debris out. Keep the truck level for the refill and check.
2. Drop the pan. Loosen all the bolts a few turns, then remove them from one end so the pan tips and drains into the bucket. Support the pan; it is heavy and slippery when full.
3. Read the pan before you clean it. A fine gray paste on the magnet is normal wear. Bronze or copper-colored glitter points at bushings or thrust washers. Clutch material that rubs off between your fingers, or a smell like burnt toast, means the fluid change is a diagnosis, not a cure. Black flakes of steel are a hard-parts failure.
4. Replace the filter. Pull the old filter straight down and make sure its seal came with it; a stuck seal left in the case is a common cause of a new filter sucking air. The FT105-type filter and gasket kit covers the 14-bolt pan.
5. Clean and reinstall the pan. Clean the magnet and pan, use a new gasket on clean flanges, and tighten the bolts gradually in a crisscross pattern. These are small bolts into an aluminum case. Use the service manual torque, and do not crush a rubber gasket.
6. Refill in stages. Add about what came out, start the engine, then follow Ford's check procedure below and finish in 1/2-pint additions.

If you have the pan off to replace solenoids or the internal harness at the same time, Sonnax's 4R70W booklet gives 106 in-lb for the valve body to case bolts. Overtightening them distorts bores and starts the shift problems you were trying to avoid.

Checking the level the way Ford does it

The owner guide's procedure is specific, and following it matters more than the quart count:

1. Drive about 20 miles (30 km), or until the fluid is at normal operating temperature, 150-170 F. After towing, hot-weather traffic or long high-speed runs, Ford says to shut it off for about 30 minutes to let it cool before checking.
2. Park on level ground with the parking brake set.
3. With your foot on the brake, start the engine and move the shifter through every range, giving each gear time to engage.
4. Latch it in Park, leave the engine running, and pull, wipe, reseat and pull the dipstick.

The stick has a cold range for 50-95 F ambient and a hot range for operating temperature. Ford lets you check cold if it is above 50 F, but warns that fluid added cold can overfill once it heats up. It is also blunt about the other direction: do not drive the truck if the level is at the bottom of the stick above 50 F.

Overfilling is the mistake I see most after a home fluid change. Ford's guide warns that levels above the safe range "may result in transmission failure," that an overfill may cause shift and engagement concerns, and that excess fluid should be removed rather than driven on. An overfilled 4R70W gets fluid whipped into foam by the rotating parts, and foam does not apply clutches. If you overshoot, pull the excess out through the filler tube with a suction gun.

Getting the fluid right

On a 4R70W the answer is MERCON V. The 2002 owner guide states that MERCON and MERCON V "are not interchangeable" and says not to mix them. It allows fluids labeled for both MERCON and MERCON V in transmissions that need MERCON V, but not in ones that need plain MERCON. Ford's current catalog has since repositioned Motorcraft MERCON V for vehicles that require "either MERCON V or MERCON." If you are working on a 4R100 Expedition, look up the current recommendation for that unit rather than relying on the 2002 table.

Three cautions from Ford's current MERCON V listing apply to these trucks:

• Do not use MERCON V where MERCON LV, MERCON SP or MERCON ULV is specified. A shop that services a 2009-up six-speed Expedition and a 4R70W Expedition on the same day needs two different jugs.
• Do not use MERCON V in a transfer case where MERCON was previously recommended. The 4x4 Expedition transfer case is a separate fill. Do not top it off from the transmission jug.
• The fluid is dyed red so you can find leaks. Red spots under the front of a 4x4 Expedition can be the transmission, the transfer case or the power steering, which also used ATF on these trucks per the guide. Check all three dipsticks and reservoirs before blaming the transmission.

When it comes back in second gear after the service

The call every shop dreads: "You changed my fluid and now it only has second gear." With both shift solenoids off, a 4R70W valve body defaults to second, so anything that kills solenoid power gives exactly this complaint. Fresh fluid did not do it.

Transmission Digest's Wayne Colonna wrote up a 2002 Expedition 4.6L with a 4R70W that came in with a list of solenoid electrical codes. The shop dropped the pan, found correct solenoid resistance, installed new solenoids anyway, put in fresh fluid and cleared the codes. It drove away in second gear only and the codes came back. The cause was the 15-amp fuse 23 in the battery junction box, which feeds the solenoids. The fuse was not blown and showed voltage on both test points, but one leg had arced and burned away inside a loose terminal, so no power got past it. The real fix was a new fuse and tightening the fuse terminal so it would not arc again.

So before anyone pulls the pan again: check for 12 volts at terminal 4 of the transmission connector with the key on, then look at fuse 23 and the case connector. A connector that got knocked, stretched or contaminated with fluid during the service is far more likely than a valve body that failed in a parking lot.

What it costs

Parts for a pan drop are a filter and gasket kit plus about 5 to 6 quarts of MERCON V. A cooler-line exchange needs 12 to 16 quarts, and a case of 12 plus a few extra covers it. Most shops bill about an hour for a pan service on an Expedition and a little more for an exchange, so it lands well under the cost of a single soft part inside the transmission. Compare that with what a burned intermediate or direct clutch costs once fluid has gone past its life on a truck that tows.

My Expedition fluid-service checklist

1. Confirm 4R70W, not 4R100, from the door-jamb code.
2. Use MERCON V in the transmission and keep it out of the transfer case.
3. Service every 30,000 miles if it tows, idles a lot or sees dust, which is nearly every Expedition.
4. Read the pan and magnet before cleaning them.
5. New filter, make sure the old seal came out, new gasket, crisscross the pan bolts.
6. Check hot at 150-170 F, running, in Park, level, after cycling the shifter. Add in 1/2-pint steps. Do not overfill.
7. If it shows up in second gear afterward, test solenoid power at the connector and fuse 23 before anything else.

Need parts for this job?

The FT105 filter and gasket kit, Motorcraft MERCON V by the case, and 4R70W solenoids, harnesses and valve bodies are on our 4R70W parts page, with checkout on site.

FAQ

What transmission fluid does a 4R70W Expedition take?

Motorcraft MERCON V. Ford's 2002 Expedition owner guide lists MERCON V for the 4R70W and plain MERCON for the 4R100, so confirm which transmission the truck has from the door-jamb code. Ford's current part numbers are XT-5-QMC for a quart and XT-5-5Q3M for a 5-quart jug. Do not use MERCON LV, SP or ULV.

How many quarts does a 4R70W Expedition hold?

Ford lists 13.1 L (13.9 qt) as an approximate dry fill, which is a fully empty transmission, converter and cooler. A pan drop with a new filter usually takes about 4 to 5 quarts. Set the final level on the dipstick hot, at 150-170 F, with the engine running in Park.

How often should I change the fluid in a 4R70W Expedition?

Ford's 1998 Expedition schedule called for a change every 30,000 miles, or every 21,000 under severe duty. The 2003 guide stretched the 4R70W normal interval to 150,000 miles but kept 30,000 miles for towing, heavy idling, dusty roads and off-road use. Most Expeditions fit those conditions, so 30,000 miles is the safer number.

Why does my Expedition only have second gear after a fluid change?

A 4R70W defaults to second gear when the shift solenoids lose power, so the cause is electrical, not the new fluid. Transmission Digest documented a 2002 Expedition where the 15-amp fuse 23 that feeds the solenoids had an arced, burned leg that passed no power even though it was not blown. Check for 12 volts at the transmission connector and inspect that fuse and the case connector first.

Related guides

• 4R70W Expedition Common Problems and Fixes
• 4R70W Expedition Shift Problems: Diagnosis and Fix
• 4R70W Expedition Slipping: Causes and Fix
• 4R70W Flush vs Drain and Fill
• 4R70W Filter and Pan Service