5R55S Rebuild Cost and What Drives It

Nobody calls a shop asking about gear ratios. They call asking what it's going to cost. On a 5R55S the honest answer is "it depends on what we find in the case," and that's not a dodge. This unit has one failure that decides whether a rebuild is an ordinary overhaul or turns into a case repair or a case swap: wear in the overdrive and intermediate servo pin bores. Most of the difference between a cheap job and an expensive one comes from that, from the valve body, and from whether the converter and cooler get dealt with properly.

I'm not going to quote you a shop price. Labor rates vary too much by region, and a number pulled off a forum does nobody any good. What I can do is walk through the parts and decisions that drive the bill, with Ford's service specs and Sonnax's wear data behind them, so you can read a rebuild estimate and know whether it's complete. Where I give you a parts price, it's what those parts sell for on our own store today. Sources are listed at the bottom.

Recommended 5R55S parts

A master rebuild kit for the overhaul itself, and a complete valve body when the bores test worn. Secure checkout on site.

5R55S Master Rebuild Kit 2002

$312.99View part

5R55S Banner Rebuild Kit 2002-2007

$318.99View part

5R55S Valve Body 2002-2008

$244.99View part

What you're paying to rebuild

Ford's diagnosis manual describes the 5R55W/S as a 5-speed with a 4-element torque converter with TCC, 3 compound planetary gear sets, 3 bands, 3 multi-plate clutches and 2 one-way clutches. The PCM runs it through four on/off shift solenoids, a PWM TCC solenoid and three pressure control solenoids (PC-A, PC-B and PC-C). The "S" means synchronous shift and the "W" means wide ratio. Sonnax's "5R55 Alphabet" article lays out the family: the W went in 2002-2003 Explorers and Mountaineers, and the S replaced it; the S also replaced the older 5R55N in the Lincoln LS and Thunderbird.

Three bands is the detail that matters for cost. Ford's apply chart shows where they work:

The overdrive band works in 2nd and 5th. The intermediate band works in 3rd. So when a 5R55S comes in with no 2nd, 3rd or 5th, you're looking at band failures, and on this unit a burned band usually has a cause in the case behind it.

Cost driver 1: servo pin bore wear

This is the big one. Sonnax describes it as "severe wear of the case at the servo apply pin bore due to continuous pin oscillation." The servo apply pin rides straight in the aluminum case. As that bore opens up, apply oil leaks past the pin into the barrel area of the case, and the band gets less pressure than the PCM commanded. As the wear gets worse, release oil cross-leaks into the apply circuits. Sonnax lists the results as 1-2, 2-3 and 4-5 flares, gear loss, gear ratio codes 732, 733 and 735 (2nd, 3rd and 5th), band lining failure, and delayed engagement in reverse, where both servos are involved.

Ford addressed it with TSB 09-12-12, which owner forums have reprinted: shift concerns and loss of 2nd, 3rd and 5th from overdrive or intermediate band failure caused by servo pin bore wear, with a procedure to measure both bores and sleeve the case if needed. It covers a long list of 5R55N, S and W vehicles, including Explorers, Mountaineers, Mustangs, the Lincoln LS and Thunderbird.

Here's why it swings the price:

• If you don't check the bores, you'll put new bands and a new kit into a case that will burn them again. The rebuild looks cheap and it comes back.
• If the bores are worn and you sleeve them, you add a bore kit and the time to machine it. The Sonnax kit (56361J-01K) has an overdrive sleeve and an intermediate sleeve made from wear-resistant aluminum, and it needs Sonnax tool kit S-56361J-TL. Sonnax's SERVO-FIX reaming fixture bolts to the case and pilots off the original pin bore centerline, not the servo piston bore, so the reamer stays true to where the pin actually runs.
• If the bore can't be saved, or the shop doesn't have the tooling, you're buying a case. That's usually the most expensive single hard part in the build.

Sonnax says it plainly on the SERVO-FIX page: before this kind of fixture, a scored pin bore often meant replacing the case, because there was no reliable way to keep the tooling concentric. That's what the sleeve saves you. When you're comparing two quotes and one is much lower, ask whether it includes measuring and sleeving the servo bores. Our servo pin bore guide covers the repair step by step.

Cost driver 2: the valve body

The second thing that separates a good rebuild from a comeback is the valve body. Sonnax says the TCC modulator bore and main regulator bore wear first on the 5R55W/S, then the VFS modulator bores as the miles pile up. The PCM adapts by commanding more pressure until the wear gets ahead of it, and then you get slipping and ratio codes. Sonnax also points out that at that stage the solenoid or servo bore often gets blamed for what's really a pressure problem in the VFS modulator bores.

That leaves three choices, each at a different price:

1. Clean and reuse. Cheapest, and only OK if the bores vacuum test good. Sonnax publishes a 5R55W/S vacuum test guide for exactly this.
2. Repair the worn bores with oversized valve kits (TCC modulator, main regulator sleeve, VFS modulator). This costs parts and bench time but keeps the original casting.
3. Replace the valve body. Faster, and on a high-mileage unit it's often the right call. A complete 5R55S valve body runs $174.99 to $419.99 on our shop depending on the year range and version.

Don't forget the solenoid body. Sonnax warns that the solenoid assembly looks like it swaps between the N, W and S, but the base plate and filter are different, and mixing them can cost you reverse, TCC apply and solenoid feed pressure. A 5R55W/S solenoid pack is $223.99 on our store. Sonnax also notes that 5R55 factory fill before May 2005 was an early MERCON V that shortened solenoid life. Hold on to that when an older unit shows up with a new solenoid pack already in it and the same complaint.

Cost driver 3: the soft parts kit

The overhaul kit is the most predictable part of the bill, but kits aren't all equal. On our store:

• A 5R55W overhaul gasket and seal kit for 2002-2010 is $198.99. It's gaskets and seals only.
• A 5R55S master rebuild kit (2002) is $312.99. It adds frictions to the gaskets and seals.
• A 5R55S Banner rebuild kit for 2002-2007 is $318.99.

Read the contents before comparing prices. A kit that doesn't include bands means buying three bands on top of it. On a unit that came in with no 2nd, 3rd or 5th, the overdrive and intermediate bands are done by definition, and I replace the reverse band too while the case is empty. Steels, bushings, the filter and a pump rebuild or pump are the other common adds. A 5R55W pump assembly is $239.99 on our shop if the pocket or gears are scored.

Cost driver 4: the converter and the cooler

A lot of cheap quotes skip this, and it's what kills new rebuilds. Ford's servicing procedure warns that after internal damage, metal particles, clutch plate material or band material may have been carried into the transmission fluid cooler, and calls those contaminants "a major cause of recurring transmission concerns." Ford's procedure is to backflush the cooler and lines with a converter/cooler cleaner, using clean automatic transmission fluid only and no solvents, and to blow them out with air afterward. If the truck has an auxiliary cooler, it gets flushed too.

A 5R55S that lost bands has pumped band lining through everything. A converter that's been full of that debris either gets replaced or rebuilt; there's no reliable way to clean one in the shop. Leaving the old converter and a dirty cooler on a fresh rebuild is how you end up doing the job twice.

Cost driver 5: fluid, and doing the job twice

Ford specifies MERCON V (XT-5-QM or XT-5-DM) for the 5R55W/S, at about 12.6 quarts (12.0 liters) total. Ford says to set the final level by the check procedure, not by how much you poured in. Its servicing manual also warns against supplemental additives, treatments or cleaning agents, saying they can cause internal damage. Plan on the full refill plus extra for the cooler flush. Check our 5R55S fluid guide for the fill procedure.

The cheapest rebuild is the one you only pay for once. Before tearing a unit down, I verify the diagnosis with a gauge. Ford's line pressure spec for a 4.6L Explorer in Drive is 100-135 psi at idle and 228-263 psi at wide open throttle stall; the 4.0L is 80-110 psi at idle with the same stall range. Stall speed should be 2557-3036 rpm on the 4.0L and 2687-3150 rpm on the 4.6L. Ford says to run line pressure before any stall test, and never to hold WOT more than 5 seconds. If the numbers point to a solenoid or valve body problem and the fluid isn't burned, you may be looking at an in-car repair instead of a rebuild. Our valve body testing guide covers that.

How I build a 5R55S estimate

This is my shop's habit, not a Ford procedure. I list every line so the customer can see it:

1. Remove and install, and teardown.
2. Soft parts: master kit plus any bands, steels and filter it doesn't include.
3. Servo pin bores: measured, and sleeved if worn. If a case is needed, it's a separate line.
4. Valve body: vacuum tested, then repaired or replaced.
5. Solenoid body: tested, correct version for the unit, primed before install.
6. Converter: new or rebuilt, never reused after a band failure.
7. Cooler and lines: backflushed per Ford.
8. MERCON V, about 12.6 quarts plus the flush, then an adaptive relearn and a road test.

If an estimate is a lot lower than that and leaves out the servo bores, the converter or the cooler, that's where the difference is. It's also usually where the comeback comes from.

Need parts for this job?

Our 5R55 parts page carries 5R55S and 5R55W master rebuild kits, overhaul gasket and seal kits, valve bodies, solenoid packs, pumps and filter kits for the Explorer, Mountaineer and Mustang. Checkout is on site.

FAQ

How much does a 5R55S rebuild cost?

It depends mostly on what's found in the case. A straightforward overhaul needs a master kit, bands, a converter, a cooler flush and about 12.6 quarts of MERCON V. The price climbs when the servo pin bores are worn and need sleeving or a case, and when the valve body needs repair or replacement. Labor rates vary too much by region to quote one number.

Why do 5R55S transmissions fail?

The best-known failure is wear in the overdrive and intermediate servo pin bores in the aluminum case. Apply oil leaks past the pin, the bands get too little pressure, and they burn. That causes loss of 2nd, 3rd and 5th and gear ratio codes. Valve body bore wear in the TCC modulator, main regulator and VFS modulator circuits is the other common cause.

Can a worn 5R55S servo bore be repaired instead of replacing the case?

Usually, yes. Sonnax's 56361J-01K kit sleeves the overdrive and intermediate pin bores using tool kit S-56361J-TL and the SERVO-FIX reaming fixture, which pilots off the original pin bore centerline. Ford's TSB 09-12-12 also covers measuring the bores and sleeving the case. A case only has to be replaced when the bore can't be salvaged.

Should the torque converter be replaced during a 5R55S rebuild?

After a band or clutch failure, yes. Ford warns that band and clutch material gets carried into the cooler and is a major cause of repeat failures, so the cooler and lines need to be backflushed. A converter full of that debris should be replaced or rebuilt, not reused.

Related guides

• 5R55W/5R55S Servo Pin Bore Wear: Why the Bands Burn and How to Save the Case
• 5R55S vs 5R55W: Differences, Interchange, and Which You Have
• 5R55S Slipping: Causes and Fix
• 5R55S Valve Body Symptoms and Testing
• 5R55S Fluid Type and Capacity