M32 Gearbox Synchromesh Hub 1st / 2nd 55564410 Alfa Romeo Fiat Vauxhall

1st & 2nd Gear Synchro Selector Hub – M20 / M32 Gearbox (Alfa Romeo, Fiat, Vauxhall)

This 1st & 2nd gear synchromesh selector hub is a genuine OEM replacement for the M20 and M32 6-speed manual gearboxes fitted to Alfa Romeo, Fiat, Vauxhall/Opel and Chevrolet vehicles. OE part number: 55564410.

Gearbox: M20 / M32 (6-speed manual)

Compatible vehicles include:

• Alfa Romeo 147, 156, 159, Brera, Giulietta, GTV, Spider, Mito
• Fiat Bravo, Croma, Grande Punto, Linea, Stilo, Tipo
• Vauxhall / Opel Astra, Vectra, Zafira, Signum, Corsa, Insignia
• Chevrolet Cruze, Lacetti
• Saab 9-3

What does the synchro selector hub do in the M32 gearbox?

The selector hub sits in the synchro assembly and guides smooth transitions between 1st and 2nd gear. It works alongside the baulk rings to match shaft speeds before engagement, preventing crunch or grind.

Is 55564410 the same as the earlier M20 hub?

Yes. This hub is shared across the M20 and M32 gearbox families. It can be used in both generations where the 1st/2nd synchro assembly is fitted.

Should I replace the baulk rings at the same time?

Eco Torque recommends replacing the baulk rings together with the hub during a rebuild — it restores full synchromesh performance and avoids repeat disassembly shortly afterwards.

Do you ship worldwide?

Yes. We dispatch from the UK and ship worldwide. Contact us for shipping rates to your country.

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: ET2009