M32 Gearbox Synchromesh 1st & 2nd Gear 55574656 Alfa Romeo Fiat Vauxhall

1st & 2nd Gear Baulk Rings – M20 / M32 Gearbox Synchromesh (Alfa Romeo, Fiat, Vauxhall)

This 1st & 2nd gear synchromesh baulk ring set is a genuine OEM replacement for the M20 and M32 6-speed manual gearboxes. It resolves crunching or grinding on 1st and 2nd gear changes caused by worn baulk rings. OE part number: 55574656. Fits Alfa Romeo, Fiat, Vauxhall/Opel and Chevrolet vehicles.

Gearbox: M20 / M32 (6-speed manual)

Compatible vehicles include:

• Alfa Romeo 147, 156, 159, Brera, Giulietta, Mito, Spider
• 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 baulk ring do in the M32 gearbox?

Baulk rings (also called synchro rings) create friction between rotating components during gear changes, matching shaft speeds so the gear slides in cleanly without crunch. Worn rings produce grinding or stiff gear engagement.

Is 55574656 the OEM part number?

Yes. 55574656 is the genuine Vauxhall/Opel/Fiat OEM part number for the M20 / M32 1st & 2nd gear synchromesh baulk rings.

Should I replace the selector hub at the same time?

Eco Torque recommends replacing the hub and baulk rings together for a complete 1st/2nd synchro rebuild. This avoids repeat disassembly and restores full gearchange quality.

Does this fit both M20 and M32 gearboxes?

Yes. The baulk ring set is shared between the M20 and M32 families, both of which use the same synchromesh design for 1st and 2nd gear.

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: ET2012