M32 Gearbox Differential Crown Wheel 67T 55182077

M32 Gearbox Differential Crown Wheel 67 Teeth 55182077 – Vauxhall Opel Fiat

A replacement differential crown wheel (ring gear) for the M32 6-speed manual gearbox. The 67-tooth crown wheel (OE reference 55182077) is a key component in the final drive differential assembly; wear or damage typically presents as whining noise, vibration at road speed, or complete final drive failure. This is a direct OE-specification replacement to restore correct gear engagement and quiet, reliable operation.

Specification:

Tooth count: 67 teeth

OE reference: 55182077

Weight: 4.5 kg

Fits transmission: M32 6-speed manual gearbox (also known as F40 in some markets)

Compatible vehicles include:

• Vauxhall/Opel Astra H/J, Vectra C/D, Zafira B
• Fiat Bravo, Punto Evo, Linea
• Abarth 500, Grande Punto
• Alfa Romeo 147, 156, GT, Mito
• Chevrolet Cruze, Lacetti (with M32 gearbox)
• Saab 9-3 (with M32 gearbox)

What are the symptoms of a worn or damaged crown wheel on the M32?

A worn crown wheel typically causes a persistent whining or howling noise that changes with road speed (not engine speed). You may also notice vibration through the floorpan or a sudden increase in noise if a tooth has chipped or broken. In severe cases the final drive may seize or lose drive entirely.

Can the M32 crown wheel be replaced without removing the gearbox?

No. The differential crown wheel is an internal component of the M32 gearbox. The gearbox must be removed from the vehicle and disassembled to replace the ring gear. This work should be carried out by a specialist gearbox repairer with the correct tooling and shim adjustment equipment.

Does the crown wheel need to be shimmed during installation?

Yes. The differential in the M32 requires correct preload and backlash settings when reassembled. Incorrect shimming leads to rapid wear, noise, or premature bearing failure. Always measure and set backlash to the manufacturer's specification using a dial gauge.

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: ET2289