Manual Gearbox BMW F20 F21 M135i F30 F31 335i N55 6 Speed GS6-45BZ K006 7617491

Listing details

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

Manual Gearbox BMW F20 F21 M135i F30 335i N55 6 Speed GS6-45BZ is an original, used manual transmission from the BMW range, designed for vehicles equipped with the N55 petrol engine. This is a solution for drivers who expect precise gear shifting, robust construction, and compliance with the manufacturer's factory standards. By maintaining OEM specifications, this gearbox is a safe choice for repairing or replacing the drivetrain.

Specifications and technical data

• SKU: 7617492
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7617492
• Substitutable numbers: 7617492, 23007617492, 7617491, 23007617491, 8609413, 23008609413, K006
• Fuel type: Petrol
• Gearbox type: Manual
• Category: Manual Transmission

Purpose and technical specifications

The presented gearbox belongs to the Manual gearboxes category and has been designed to work with the N55 petrol unit in BMW 1 Series F20/F21 M135i and 3 Series F30 335i models. The manual design of the transmission provides a direct connection between the driver and the drivetrain, which translates into more engaging handling and better control over the engine's performance characteristics.

The transmission type is manual, which means a classic layout with a mechanical selector and a driver-operated clutch. Its application in petrol-powered cars ensures that gear ratios are matched to the high torque and rev range typical of the N55 engine, which promotes dynamic yet predictable driving.

Benefits of using an original BMW gearbox

Using an original BMW manual gearbox instead of a damaged or worn transmission allows you to maintain the factory performance parameters of the drivetrain. A properly selected gearbox:

• maintains the correct gear ratios, which affects the car's acceleration and flexibility,
• ensures compatibility with factory equipment (clutch, half-shafts, mounts, control system),
• reduces the risk of fitment issues typical of aftermarket replacements or incorrect transmission versions.

As a result, the time required for installation and vehicle configuration can be significantly reduced, and the mechanic can focus on proper service rather than modifications to the installation or mounts.

Condition, verification, and OEM selection

The gearbox is offered as a used component, which allows for optimized repair costs while maintaining the original BMW specification. Before installation, a standard service procedure is recommended: checking for leaks, verifying clearances, assessing the operation of the selector mechanism, and changing the transmission oil in accordance with the vehicle manufacturer's recommendations.

For the correct selection of the transmission for a specific car, it is crucial to compare the OEM part number and interchangeable numbers with the vehicle documentation or data from the service system. This helps avoid version mismatches, differences in gear ratios, or mounting points. In case of doubt, it is worth using the VIN and the manufacturer's catalog to confirm full compatibility.

If you want to better understand how to safely buy drivetrain components from the secondary market, how to interpret OEM markings and replacement numbers, and how to assess the cost-effectiveness of a purchase, the following expert guide will be helpful: Why it is worth buying used gearboxes and engines – facts instead of myths.

Application in BMW drivetrain with a petrol engine

A manual gearbox combined with the N55 petrol engine allows you to fully utilize the potential of the powertrain – both in daily use and during more dynamic driving. Properly selected gear ratios support:

• efficient starting and smooth acceleration across the entire rev range,
• maintaining optimal engine RPM during highway driving,
• precise torque delivery to the wheels in low-grip conditions.

For users who value an active driving style, a manual transmission in a BMW M135i or 335i is an important element of the car's character, allowing for conscious gear management and a better feel for the drivetrain's operation.

Expanding the scope of repairs – BMW manual gearboxes

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as transmission housings, selector mechanisms, or additional mounting elements, check out the available parts in the BMW manual gearboxes category.

Summary

Manual Gearbox BMW F20 F21 M135i F30 335i N55 6 Speed GS6-45BZ is a solution for those who want to restore the full efficiency of the drivetrain while maintaining the factory handling characteristics. An original, used manual transmission intended for a petrol engine allows for a technically correct repair without the need for interference with the vehicle's construction. It is a practical choice for workshops and users who prioritize compliance with BMW documentation and predictable car behavior after a gearbox replacement.