M32 GEARBOX | Guide To Faults & Fixes
A guide to the common faults and repairs including uprating the Vauxhall, Alfa Romeo, Fiat M32 gearbox . If you are unfamiliar with its factory name the M32 gearbox is the common 6 speed gearbox found in most Vauxhalls as well as Alfa Romeo and Fiat. We will list the models that have this unit later in the guide.
So chances are if you're reading this you either have issues with or have suffered from problems with you M32 gearbox. You're not alone and this gearbox has kept Eco Torque very busy over the last few years. In fact we are up to around 700 mark on repairs or complete replacements on this one particular type of gearbox alone.
As there is so much information and updates with this unit there may be separate standalone guides so be sure to search M32 in the tags and search option to get the full story.
So onto the common symptoms.........
6th Gear Bearing Whine
By far the most common symptom we have described to us and manifests itself in a loud whining sound mainly in 6th gear.
This is down to the wear in the 5th/6th output shaft bearing and creates a distinct whining sound mainly noticeable in 5th and 6th gear. A common misconception is that 6th gear it self has its own bearing however this bearing along with another supports a whole shaft of gears.
If this issue is left too long it will result in the bearing fully collapsing causing servere damage to the internals and in some cases ejecting metal out of the end casing of the gearbox.
Gear Stick Movement
This issue is directly related to the issue above and stems from wear in the 5th/6th output shaft end bearing.
It results in a downwards movement of the gear stick (towards the centre of the vehicle) in 1st and 5th gear. These gears share the same shaft and it the reason why you see the issue on both gears. At this stage the end bearing is very worn and results in the whole shafts physically moving our of place inside the gearbox. This transmits the movement through the selector forks and out through the linkage into the gear stick. As you can imagine gearboxes are very precise bits of engineering so movement in this way is a very serious matter!
Another common misconception is that people know of the gear stick symptom but notice it in 2nd 4th and 6th and think their gearbox has the fault. This is not the case and is simply engine movement transferring through the linkage.
Watch the video below to see what the gear stick movement symptom looks like.
Constant Bearing Whine From 20 MPH Upwards
This one is less common but often comes to us after being misdiagnosed as a wheel bearing issue. The constant whine starts at 20-25 MPH and is present even if the clutch is depressed. This is due to the fact that the bearing at fault spins with the output shaft and differential, so will ultimately make a sound if the vehicle is in motion. This issue will require a full bearing rebuild to resolve.
Crunching Or Loss Of Gears
Very common especially in 2nd, 3rd and 4th gear. This starts of with intermittent crunching when selecting gears. This progresses with the crunching becoming constant and then develops to gears "popping out". At this stage the wear on the gear has caused it to lose a proportion of its contact teeth meaning there is simply not enough there to keep the gear engaged. This will ultimately lead to the complete loss of the gear.
This issue can be increased drastically by a worn clutch system and heavy gear changes. The Vauxhall VXR models are more prone to this issue due to the nature of driving style they exhibit.
The pictures below show the worn teeth on the top of the gears
Sloppy & Stiff Gear Selection
This issue is normally the linkage between the gearbox and gear stick rather than an internal issue. It can feel like moving the gear stick through a thick fluid when trying to select gear. This will require the linkage cables being replaced.
2. Who's Affected
We see mainly Vauxhall when we repair the M32 gearbox. This is partly due to our geographic location, being based 15 miles from Luton, the home of Vauxhall. However its mainly down to the fact that there are a huge amount of them on the road, spanning numerous models over various years.
Makes and models effected include
3. M32 Solutions
We offer a huge variety of repair or replacement options for the M32 gearbox including some upgrades that will extend its lifespan.
Full Bearing Rebuild 6 Bearings Including Fitting & Oil - £595 Inc VAT
Modified End Case Full Bearing Rebuild Including Fitting & Oil - £795 Inc VAT
2nd Gear Repair (Includes 2nd Gear, 1st & 2nd Hub With Synchros) - £345 Inc VAT
3rd/4th Gear Repair (Includes 3rd/4th Gear, 3rd&4th Hub With Synchros) - £399 Inc VAT
5th/6th Gear Repair (Includes 5th/6th Gear, 5th&6th Hub With Synchros) - £375 Inc VAT
M32 Full Recon Unit (Exchange Basis Only) - £895 Inc VAT
Modified End Casing Available - £POA
** Eco Torque offers a 18 Month 18'000 Mile Warranty on bearings when fitted with the modified/updated end casing.
Further options please contact us for details: email@example.com
As there is such a huge wealth of information about the M32 Gearbox this page may be updated from time to time.
Please check out our other guides including the updated end casing for the M32 unit.
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