Ford Focus Mk2 ST 2.5 Duratec Manual Gearbox 6 Speed M66 666R-7002-AH WARRANTY

Listing details

The gearboxes are sold with a 90-day warranty! They were tested before removal and are in full working order.

Ford Focus Mk2 ST 2.5 Duratec Manual Gearbox 6 Speed M66 is a factory-original manual transmission designed for the performance version of the Focus with a petrol engine. The M66 design ensures precise gear shifting, adequate durability under higher loads, and characteristics tailored for dynamic driving. This is a solution for users who expect a proven, original gearbox with predictable behavior and stable operating parameters.

Specifications and technical data

• SKU: 666R-7002-AH
• Mark: Ford
• Condition: Used
• OEM Part Number: 666R-7002-AH
• Substitutable numbers: 1771351, 1592279, 666R-7002-AH, 666R7002AH, 666R7002AG, 666R-7002-AG
• Fuel type: Petrol
• Gearbox type: Manual
• Part type: Manual Transmission
• Category: Manual Transmission

Purpose and technical characteristics

The presented gearbox belongs to the Manual transmissions category and was designed specifically to work with the five-cylinder petrol unit in the second-generation Ford Focus ST. The 6-speed layout allows for maintaining an optimal RPM range both during acceleration and highway driving, which translates into better flexibility and acoustic comfort.

The manual design of the transmission provides a direct connection between the driver and the drivetrain, allowing for conscious management of the engine's torque. The applied gear ratios promote dynamic acceleration while simultaneously allowing for economical driving at constant speeds.

Benefits of using the M66 gearbox in the Ford Focus Mk2 ST 2.5

Choosing this gearbox is a solution dedicated to users who expect consistency with the factory vehicle configuration and predictable drivetrain behavior. Key advantages include:

• Proper fit for the petrol engine – gear ratios characterized and prepared for the specifics of the 2.5 unit.
• Manual control, which allows for fully utilizing the engine's potential across the entire RPM range.
• Consistency with Ford's factory drivetrain architecture, which facilitates installation and subsequent maintenance.
• The ability to maintain the original character of the ST version without the need to adapt solutions from other models.

Thanks to these features, the gearbox performs well both in daily use and in more dynamic operation, where repeatability and predictable reactions to gear changes are important.

Condition, verification, and practical application

This component comes from the secondary market, which allows for reducing the costs of repair or modernization of the drivetrain while maintaining the manufacturer's original specification. Such gearboxes are frequently chosen both for standard replacement of a worn transmission and for projects based on the stock Ford Focus ST configuration, where compatibility and predictable behavior under load are priorities.

Before installation, a standard workshop procedure is recommended: checking for leaks, verifying mounting points, inspecting the gear selector mechanism, and using the appropriate transmission oil in accordance with the vehicle manufacturer's recommendations. This approach increases the durability of the system and reduces the risk of premature wear.

Selecting the right gearbox and technical support

To correctly select a gearbox for a specific Ford configuration, it is worth paying attention to compatibility with the power unit, fuel type, and installed equipment. Manufacturer markings and reference numbers are helpful, as they allow for verifying compatibility with a given body version and model year. In case of doubt, consulting a mechanic or a specialist dealing with Ford models is a good solution.

For users who want to deepen their knowledge regarding transmission selection, common faults, and methods for assessing the condition of secondary market components, the following guide will be useful: Gearbox: manual, automatic, or DSG – common faults and a guide to buying a used gearbox. The article discusses practical aspects of purchasing used transmissions and points out what to look for before installation.

Expanding work within the Ford drivetrain

If you are planning a comprehensive repair or modernization of the drivetrain area in your Ford and need other components from the same group, such as additional transmissions, gear control elements, or compatible mounting components, check the available parts in the Ford manual transmissions category.