5R55W Fluid Change Cost: Parts, Labor and the Right Way to Do It

The 5R55W fluid change is one of those jobs where the quote you get depends almost entirely on how the shop does it. One place drops the pan, swaps the filter, pours in five quarts and calls it done. Another pulls the converter drain plug, refills close to the full 12.6 quarts, and sets the level hot on a scan tool the way Ford wrote it. Both call it a "fluid service." Only one of them actually replaces most of the fluid.

This post breaks down what a proper 5R55W fluid and filter service involves, what the parts cost, where the labor goes, and why the cheap version usually isn't a bargain on this transmission. The capacities, torques and procedure come from Ford's 5R55W/S service information for the Explorer and Mountaineer (Ford/Mitchell servicing section), with fluid specs from Ford's own Motorcraft lubricant data. Everything is listed under Sources at the bottom.

Recommended 5R55W parts

Everything for a full 5R55W fluid service: the filter and pan gasket kit, a 12-quart case of Motorcraft MERCON V to cover the 12.6 qt capacity with the converter drained, and cooler line disconnect tools if you are backflushing the cooler. Secure checkout on site.

5R55W/5R55S Transmission Filter and Pan Gasket Kit

$46.99View part

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

$173.99View part

OTC 6593 Transmission Cooler Line Disconnect Set, 3/8 in and 1/2 in Tools for 2003-Newer Ford Explorer 5R55W and Super Duty 4R100

$41.99View part

Which trucks this applies to

Per Sonnax's 5R55 identification guide, the 5R55W went into the 2002-2003 Ford Explorer and Mercury Mountaineer, and the 5R55S replaced it in those SUVs from 2004. [4] The S uses a larger 38-tooth-OD sun gear versus the W's 24-tooth, but the pan, filter, fluid and fill procedure are the same, so everything below covers both. The 5R55N in the Lincoln LS, Thunderbird and Jaguar S-Type is a different unit with a different valve body and isn't covered here.

What the job actually is, per Ford

Ford's draining and refilling procedure for the 5R55W/S is more involved than a typical pan drop. The steps, in short:

1. Pull the pan drain plug and let it drain. Then remove the 16 pan bolts, the pan and the gasket.
2. Remove the two filter bolts and discard the filter. Clean the pan and the magnet.
3. Remove the converter housing access plug on the bottom of the bellhousing, rotate the converter to the drain plug, and pull it. Let the converter drain.
4. Install a new converter drain plug. Ford is explicit that a new one must be used to prevent leakage [1].
5. Lube the filter seals with clean ATF, then install the filter, pan magnet, gasket and pan. Torque the pan bolts in a crisscross sequence.
6. Fill through the pan's level check plug with a suction gun and fill tool, then set the level with the engine running and the fluid at temperature.

That converter drain step is the whole ballgame on cost versus value. A 5R55W holds about 12.6 quarts (12.0 L) total per Ford. [1] Drop only the pan and you replace a minority of that; the rest stays in the converter, the valve body, the clutch drums and the cooler circuit. Draining the converter too gets you most of the way to a full change in one visit.

Torque specs you need

Note that the pan bolts and converter plug are in inch-pounds. Overtightening the pan bolts crushes the gasket and distorts the pan rail, which is how a fluid service turns into a leak comeback. Ford's note says the factory pan gasket is reusable if it inspects clean, but on a truck that's 20 years old, I replace it every time.

The fill procedure is where cheap services go wrong

There's no dipstick on a 5R55W. Level is set at the pan, through a small center plug inside the larger drain plug. Ford's check procedure runs like this:

• Monitor transmission fluid temperature with a scan tool using the TFT PID, engine idling at about 650 rpm [1]. ATRA Technical Bulletin 746 gives the same 650 rpm idle and an 80-120°F (27-49°C) finish window for the 5R55N, 5R55S and 5R55W [6].
• Bring TFT to 81-120°F (27-49°C). Move the shifter slowly through each gear and back to Park.
• Get the truck as level as possible on the lift. Ford even calls out a drive pinion angle gauge to help.
• With the engine running in Park, hold the larger drain plug with a wrench and remove the small level plug with a 3/16-inch Allen. When the fluid comes out as a thin stream or a drip, the level is correct.
• If nothing comes out, pump in about a pint with the suction gun and fill tool, wait a minute, and keep adding in half-pint increments until it drips [1]. ATRA's version of the procedure uses Ford adapter 307-437 in the center of the drain plug and a fluid transporter at no more than 30 psi of shop air, adding one pint at a time and reinstalling the level plug at 10 Nm (89 lb-in) [6].

Two details matter here. First, Ford notes that capacities are approximate and the level has to be set by this check, not by how many quarts went in. Second, if the shop uses pressurized fill equipment, Ford says to reduce it to 1 psi. More than that pushes fluid out of the vent, and it then looks like a leak coming from the converter area [1]. I've seen trucks come in for a "converter seal leak" a week after a quick-lube service for exactly that reason.

A shop that doesn't have a scan tool on the truck while filling is guessing at temperature, and a 5R55W that's a quart low or a quart high at the wrong temperature will shift poorly and run hotter. Ask how they set the level before you hand over the keys.

The right fluid

Ford specifies MERCON V for the 5R55W/S (Motorcraft XT-5-QM in the service manual, sold today as XT-5-QMC quarts, XT-5-5Q3M five-quart jugs, or XT-5-DMC drums). Ford's Motorcraft data sheet says not to use MERCON V where MERCON SP, MERCON LV, MERCON ULV or Type F is called for, and the reverse matters too: a low-viscosity fluid is not a stand-in for MERCON V in this unit. [2] The service manual also warns against supplemental additives, treatments or cleaning agents in the transmission, which rules out the bottle of "shift fix" some counters push with a fluid change. Ford's current Motorcraft ATF quick reference chart backs both points. It still lists the 5R55N/W/S under MERCON V, and unlike the 5R110, 6HP26 and 6R60/6R75 columns it carries no note authorizing back-service with MERCON LV. [3] The same chart repeats the caution against supplemental fluid additives, treatments and cleaning agents.

For planning, buy enough for the full 12.6-quart capacity when the converter is getting drained. You won't use all of it, but running short halfway through the level check on a lift is how people end up topping off with whatever's on the shelf.

What a 5R55W fluid change costs

Prices move, so treat these as working numbers rather than a quote. Here is how it breaks down at our own on-site prices, and what I typically see shops charge.

At an independent shop, a pan-and-filter service with the converter drained and the level set on a scan tool typically lands somewhere in the $250-450 range depending on labor rate and fluid markup. Dealers run higher. A pan-only "drop and fill" can be quoted well under that, but you're paying for four or five quarts of new fluid in a 12.6-quart system.

Get a signed written estimate that names the parts and the labor, and ask up front how the shop prices labor, since many bill a flat rate from a published time guide rather than actual clock time. For this job, ask specifically whether the price includes draining the converter and setting the level at temperature with a scan tool. Those two items are what separate a real 5R55W service from an oil change for the transmission.

Machine exchange versus pan drop

A cooler-line fluid exchange machine replaces more fluid than a pan drop, but it doesn't change the filter, and it doesn't let you look at the pan. On a high-mileage 5R55W, what's on the magnet is the single best piece of diagnostic information you'll get for free. Heavy bronze or steel means the job isn't a fluid service anymore. If a shop offers an exchange, ask for it on top of a pan drop and filter, not instead of one.

Don't forget the transfer case

On 4WD and AWD Explorers and Mountaineers, the transfer case is a separate service with a separate fluid. Ford's 2002 service data lists the 44-03 and 44-05 transfer cases on MERCON ATF (XT-2-QDX), not MERCON V, at about 2.6 pints on AWD and 3.0 pints on 4WD, with drain and fill plugs torqued to 17 lb-ft (AWD) or 11 lb-ft (4WD). Ford's Motorcraft data sheet specifically says MERCON V is not for transfer cases where MERCON ATF was previously recommended. If a shop quotes "transmission and transfer case" with one fluid, that's a red flag. It's a small add in parts and labor, and worth doing at the same visit if it hasn't been done.

How often, and why it matters more on this unit

Ford lists 150,000 miles for normal service and 30,000 miles for severe service: heat over 90°F, heavy loads or hills, towing, a car-top carrier, police/taxi/delivery use, and dusty or off-road driving. Almost every Explorer still on the road qualifies for severe service by that definition. [1]

The 5R55W has a reason to care more about fluid condition than most. ATSG's Wayne Colonna traced repeat overdrive planetary failures on the 5R55N/S/W to the cooler bypass valve built into the transmission, which cuts flow to the cooler and lube to the overdrive planet when it misbehaves. [5] A unit that already runs marginal on lube does not tolerate fluid that's been cooked past its useful life. Fresh MERCON V won't fix a bad bypass valve, but old, oxidized fluid on top of one is how the planet goes. There's more on that in our 5R55W overheating guide.

When a fluid change is the wrong call

If the fluid is black and smells burnt, or the pan has a layer of friction material, a fluid change at this point is a gamble. It won't restore worn clutches, and an already-slipping unit can behave worse once fresh fluid with different friction characteristics replaces the degraded fluid. Pull the pan first, look, and price a rebuild alongside the service. Our 5R55 rebuild cost breakdown covers what that looks like.

Need parts for this job?

Our 5R55 parts page has the 5R55W/5R55S filter and pan gasket kit, Motorcraft MERCON V by the case, cooler line disconnect tools for flushing the cooler, and overhaul and master kits for units that are past a fluid service. Checkout is on site.

FAQ

How much does a 5R55W fluid change cost?

Parts for a full service with the converter drained run roughly $225-235: about 12 quarts of MERCON V, a filter and pan gasket kit, and a new converter drain plug. Independent shops typically charge somewhere around $250-450 for that job depending on labor rate and fluid markup, with dealers higher. A pan-only drop and fill costs less but replaces only a fraction of the 12.6-quart capacity.

How many quarts does a 5R55W take?

Ford lists about 12.6 quarts (12.0 L) total for the 5R55W and 5R55S. That figure is approximate, and Ford says the final level must be set with the check plug procedure at 81-120F TFT, not by counting quarts. A pan drop alone takes far less than the total.

Does the 5R55W have a torque converter drain plug?

Yes. Ford's procedure has you remove the converter housing access plug on the bottom of the bellhousing and pull the converter drain plug to drain it. Ford requires a new converter drain plug on reinstall to prevent leakage, torqued to 89 lb-in.

What fluid does a 5R55W use?

MERCON V, Motorcraft XT-5-QMC in quarts. Ford's data sheet says not to use MERCON V where MERCON SP, LV, ULV or Type F is specified, and the service manual warns against any supplemental additives. On 2002 4WD and AWD models the transfer case takes MERCON ATF, not MERCON V.

How often should 5R55W fluid be changed?

Ford lists 150,000 miles under normal service and 30,000 miles under severe service, which covers heat over 90F, heavy loads, hills, towing, delivery or police use and dusty or off-road driving. Most Explorers and Mountaineers fall into severe service, so 30,000 miles is the realistic interval.

Related guides

• 5R55S Fluid Type and Capacity
• 5R55S Filter and Pan Service
• 5R55W Overheating: Causes and Prevention
• 5R55S Rebuild Cost
• Ford 5R55S and 5R55W Transmission Problems