Is this a main shaft gear or a countershaft gear?

This specific part is the 3rd gear assembly for the main shaft, but please verify your application.

Does this gear come with the matching synchro hub?

No, this is just the gear itself; the synchronizer sleeve and hub are sold separately.

What is the tooth count on this gear?

The tooth count is precisely matched to the OEM ratio for the Z4 transmission.

Can this gear be used for a close-ratio transmission build?

Yes, if it is a performance gear set, but this is a standard OEM replacement ratio.

How do I identify if this is the correct gear for my Z4?

You must match the tooth count and the internal spline pattern to your existing gear.

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Part

Gear Assembly

Compatible with BMW Z4

✓ Fits 3 Verified BMW Z4 Variants

Z4 M40iZ4 M40i Pure Impulse ATZ4 M40i Pure Impulse

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Product Description

Replace worn or broken gears with this precision-cut gear assembly for your Z4 transmission. Whether a specific speed gear or a countershaft, this component matches OEM tolerances. Directly compatible with the existing bearings and shafts in your Z4 gearbox. Restore the integrity of your Z4 transmission with this machined gear assembly.

Key Features

CNC-hobbed gear teeth for perfect meshing
Case-hardened surface for wear resistance
Tough core material to resist shock loads
Precision-ground bore for accurate shaft fit
Individual gear component for specific positions

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