M32 Gearbox Gen 2 - 4th Input Gear (45T) 55182042 Vauxhall Alfa Romeo Fiat

M32 Generation 2 4th Input Gear (45T) 55182042 – Vauxhall, Opel, Alfa Romeo, Fiat, Abarth, Chevrolet, SAAB

Replacement 4th input gear for the M32 Generation 2 6-speed manual gearbox, featuring 45 teeth (45T). This gear is not compatible with the Generation 1 or Generation 3 M32 gearbox (2016 onwards) — please verify your sub-code and internal gear measurements before ordering. OE part number 55182042.

Part Number: 55182042

Gearbox: M32 Generation 2 (6-Speed Manual)

Sub-Code: MZ0 (up to 07/01/2016)

Teeth: 45T (45 teeth)

Weight: 1.0 kg

Vehicle Compatibility:

Abarth: Grande Punto 199 (2007–2009), Punto 199 (2012–2014), Punto Evo 199 (2010–2012)

Alfa Romeo: 147 937 (2000–2010), 159 939 (2005–2011), Brera 939 (2006–2011), Giulietta 940 (2010–2021), Mito 955 (2008–2020)

Chevrolet (EU): Aveo T300 (2011–2014), Cruze J300/J305/J308 (2009–2014), Malibu V300 (2011–2015), Orlando J309 (2010–2014), Trax/Tracker (2013–2014)

Fiat: Bravo 198 (2007–2015), Croma 194 (2005–2010), Grande Punto 199 (2005–2011), Linea 323 (2007–2014), Punto Evo 199 (2009–2012)

Opel/Vauxhall: Adam M13 (2013–2019), Astra H A04 (2004–2010), Astra J P10 (2009–2018), Astra K B16 (2015–2022), Cascada W13 (2013–2019), Corsa D S07 (2006–2015), Corsa E X15 (2015–2019), Insignia A G09 (2008–2017), Insignia B Z18 (2017–2022), Meriva A X03 (2003–2010), Meriva B S10 (2010–2017), Mokka J13 (2012–2016), Mokka X J13 (2016–2019), Signum Z03 (2003–2008), Vectra C Z02 (2002–2009), Zafira B A05 (2005–2014), Zafira C P12 (2012–2019)

SAAB: 9-5 (2010–2011)

How do I know if I have a Gen 2 M32 gearbox?

The M32 gearbox was produced in three main generations. Gen 2 units use the sub-code MZ0 and were manufactured up to 07/01/2016. Check your gearbox code plate or measure the internal diameter of the gear before ordering to confirm compatibility.

Is this gear compatible with all M32 gearboxes?

No. This gear fits Generation 2 M32 gearboxes only (sub-code MZ0, up to 07/01/2016). It is not compatible with Gen 1 or Gen 3 (2016 onwards) M32 units. Please verify your gearbox generation before ordering.

What causes 4th gear failure on the M32?

The M32 4th input gear can suffer from cracking, chipping, or excessive wear — often related to the known M32 bearing failure that allows shaft movement under load. It is advisable to address the bearing issue at the same time as replacing the gear to prevent recurrence.

What is the OE part number for this gear?

The OE part number is 55182042, used across Vauxhall, Opel, Alfa Romeo, Fiat, Abarth, and Chevrolet applications sharing the M32 Gen 2 platform.

Can I fit this gear myself?

M32 gearbox internal work requires the gearbox to be removed and disassembled. This is a specialist job. Eco Torque can supply all the parts needed for a full rebuild — contact us for assistance.

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: ET2945