Will this part fit my 2004–2005 Mercury Mountaineer?

Use your 17-character VIN or license plate on our site to verify this transmission matches your 2004–2005 Mercury Mountaineer. Our team can also confirm by phone or chat.

Does Peak Powertrain include a warranty?

Many engines and transmissions include warranty coverage. See the product page and warranty policy for term details on your specific unit.

How long does shipping take?

Most in-stock units ship within 1–2 business days. Delivery typically arrives in 3–7 business days depending on your location.

How do I confirm this part fits my vehicle?

Use the compatibility card above with your VIN or year, make, and model. Checkout stays blocked until fitment is verified on drivetrain units.

What will I pay today besides the list price?

Your due-today total includes commercial freight (from $279.00 USD), optional residential delivery, a refundable core deposit, and an optional install kit when offered. Warranty is included — not sold separately.

What is the core charge?

The core charge is a refundable deposit for your old unit. Return the core in acceptable condition within the program window and the deposit is credited back.

Is Expedia Protection warranty included?

3 yr · unlimited mi · Parts + Labor when fitment is verified before checkout.

Can I add an installation kit?

Yes — reman transmissions can add an optional kit (about $89.00 USD) in the price breakdown before you add to cart. Contents vary by application.

5R55S Remanufactured Automatic Transmission

Name: 5R55S Remanufactured Automatic Transmission
Brand: Mercury
SKU: MTRM00709P
Price: 2914 USD
Availability: InStock

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Enter your VIN, license plate, or year / make / model to find the right fit.

This product includes

Trans 5R55S

5R55S Remanufactured Automatic Transmission

$2,914.00 USD

TransmissionREMANTOP CHOICE36-MO WARRANTY

Best mix of reliability, warranty, and value — our highest-confidence pick.

Why this one: 36-mo warranty · In stock

Score 62/120 · 36-mo warranty
Updated internals

No reviews yet — be the first to review this part

SKU: MTRM00709P

Delivers in 15–26 business days · arrives by Fri, Dec 11

One left in stock — order soon

Complete fitment verification to check warranty eligibility.

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Vehicle Specifications

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Part Attributes

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Remanufacturing Process: A Smart Choice

Remanufactured transmissions provide a reliable and cost-effective alternative to new or used units, making them an excellent choice for mechanics who prioritize quality, performance, and efficiency. But what exactly goes into the remanufacturing process, and why is it a smart investment for professionals in the automotive industry?

The Remanufacturing Process

Inspection & Disassembly

Every transmission core is carefully inspected for wear, damage, or defects. It is then completely disassembled, with each component thoroughly cleaned and assessed for reusability.

Replacement of Worn or Defective Parts

Any components that do not meet OEM (Original Equipment Manufacturer) standards are replaced with new or re-engineered parts. This includes bearings, seals, gaskets, clutches, and other critical components.

Machining & Resurfacing

Key components like valve bodies, torque converters, and gears are resurfaced or machined to restore their original specifications, ensuring optimal performance.

Upgrades & Enhancements

Many remanufactured transmissions incorporate design improvements that address common failure points, resulting in a more durable and efficient unit than the original factory version.

Reassembly & Testing

The transmission is carefully reassembled by expert technicians and subjected to rigorous dyno testing to simulate real-world driving conditions. This ensures smooth shifting, proper fluid pressure, and overall reliability.

INCLUDED WARRANTY PROGRAM

PROTECTION

More Than Benefits.

Warranty coverage is included at $0 when fitment is verified— not sold as a separate protection plan.

Terms follow value tier and part category. File claims through your account after delivery.

Parts + Labor

Included on remanufactured

Unlimited Miles

On remanufactured units

View warranty coverage How to file a claim

Protection

All our products are backed by a warranty that exceeds industry standards. *See warranty details on our website.

ABOUT US

Peak Powertrain is your go-to destination for drivetrain replacements. We specialize in remanufactured engines and transmissions, offering high-quality parts for American, Japanese, and other vehicles. Committed to excellence, we provide reliable performance with warranty-backed fitment.

Learn More

Customer reviews

Get rewarded for your opinion — earn 500 points ($5) when your verified-purchase review is approved. Rewarded reviews are labeled as such. Your reward is never based on your rating.

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Other remanufactured options for this fitment

Every distributor's unit for the same fitment, lowest part price first. Core charges are refundable deposits — they never count toward which unit is cheaper.

Remanufactured Transmission T5R55S4002T4
36-mo warranty · No reviews yet · In stock
$2,200.00 USD
+ $350.00 USD refundable core deposit
$714.00 USD less than this unit (part price)
Lowest part price
Remanufactured Transmission T5R55S4602T2
36-mo warranty · No reviews yet · In stock
$2,200.00 USD
+ $350.00 USD refundable core deposit
$714.00 USD less than this unit (part price)
Remanufactured Transmission T5R55S4602T4
36-mo warranty · No reviews yet · In stock
$2,200.00 USD
+ $350.00 USD refundable core deposit
$714.00 USD less than this unit (part price)
Remanufactured Transmission T5R55S4002T2
36-mo warranty · No reviews yet · In stock
$2,200.00 USD
+ $350.00 USD refundable core deposit
$714.00 USD less than this unit (part price)
5R55S Automatic Transmission Assembly
36-mo warranty · No reviews yet · In stock
$2,467.00 USD
+ $600.00 USD refundable core deposit
$447.00 USD less than this unit (part price)
Remanufactured Transmission
36-mo warranty · No reviews yet · In stock
$2,874.56 USD
+ $435.00 USD refundable core deposit
$39.44 USD less than this unit (part price)
5R55S Remanufactured Automatic Transmission
36-mo warranty · No reviews yet · In stock
$2,914.00 USD
+ $600.00 USD refundable core deposit
5R55S Remanufactured Automatic Transmission
36-mo warranty · No reviews yet · In stock
$2,914.00 USD
+ $600.00 USD refundable core deposit
Remanufactured Transmission
36-mo warranty · No reviews yet · In stock
$3,018.36 USD
+ $435.00 USD refundable core deposit
Remanufactured Transmission
36-mo warranty · No reviews yet · In stock
$4,312.56 USD
+ $600.00 USD refundable core deposit

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Enter your VIN, license plate, or year / make / model to find the right fit.