M32 Gearbox Gen 3 - 2nd Gear (40T) 55580385 Vauxhall Alfa Romeo Fiat

M32 Gearbox Gen 3 Second Gear 40 Tooth – Vauxhall / Alfa Romeo / Fiat

This is an M32 6-speed gearbox second gear with 40 teeth, Vauxhall OE part number 55580385. This component is a direct replacement for the generation 3 M32 gearbox (2016 onwards). The 40-tooth second gear is a variant of the Gen 3 M32 ratio set and must not be confused with the 41-tooth version (55580384). Not compatible with M32 Gen 1 or Gen 2 gearboxes.

OEM Reference: 55580385
Tooth Count: 40 teeth
Application: Second gear (2nd)
Compatibility: M32 Generation 3 (2016 onwards) ONLY

Fits: Vauxhall, Alfa Romeo, Fiat, Opel and SAAB models fitted with the M32 Gen 3 6-speed manual gearbox from approximately 2016 onwards. Contact us to confirm compatibility with your specific vehicle registration.

What is the difference between 55580384 and 55580385?

Both are Gen 3 M32 second gears, but with different tooth counts — 41T vs 40T. They suit different final drive ratio configurations within the Gen 3 M32 family. Use your OE part number or VIN lookup to confirm which tooth count your gearbox requires.

How do I confirm which M32 generation I have?

Gen 3 gearboxes were introduced around 2016. Check the gearbox code stamped on the casing, or send us your VIN for a precise generation confirmation.

What symptoms indicate second gear failure?

Common signs include crunching or refusal when selecting 2nd gear, jumping out of 2nd under load, or grating that worsens over time. These usually point to synchromesh or gear tooth wear.

Is this a genuine OEM part?

Yes. Part number 55580385 is an original Vauxhall OEM component.

Can I fit this gear myself?

Full gearbox disassembly is required. This is not a DIY job — specialist tools and preload knowledge are essential. We can advise on rebuild services if needed.

Why Choose Eco Torque?

As specialists in gearbox rebuilds and repairs, Eco Torque takes pride in offering genuine gearbox parts, high-quality aftermarket alternatives and competitive pricing.

Need Help Finding the Right Part?

If you are unsure whether this part is compatible with your vehicle, send us your UK registration number or VIN and we will help you find the correct part.

Reference Number: ET2360