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Question: is the M32 gearbox from a Brera/159 exactly the same as the one used in other models (vauxhall, fiat etc). I.e. could an M32 gearbox from a vauxhall be fitted directly to a 159 - or can you only use an Alfa M32???
 

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In the 159 there are at least 3 different variants of the Getrag M32 gearbox, as the JTDm, JTS and TBi use different gear ratios. Don't know about other brands, I assume they are also slightly different.
 

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When I had the M32 problem, I took it to a local gearbox specialist and he just replaced the whole thing with a shiny rebuilt one off the shelf. I don't know what car that would have originally come off, but everything felt exactly the same .. well apart from the lack of whine and twitching gear stick.
 

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You know there is also a solution to replace the bearings in situ?
Not sure if this is the durable option, but I've read some topics from people who did this.

That's what I'd prefer, to keep the original box.
 

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There is a fella in Halifax, A&S Clutch technology who is very well recommended and changes all the gear cluster bearings in situ, in less than a day for about £300 and all guaranteed.
His every day work is Vauxhalls but does Alfas with the same m32 box.
Where ever you are in the uk its worth considering, even allowing for the price of a tank of fuel and a night in a travelodge.
 

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I would assume the ratios will be the same for a similar vauxhall variant. Can’t imagine an insignia 1.9cdti 150bhp will be different to a 159 150 bhp jtdm. Obviously the petrol ones will look the same but will have different gear ratios.
 

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Brera '06 2.2 JTS
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It's best to upgrade the entire gearbox if you can afford it. The 2nd generation casing has increased oil channels to help prevent the early bearing wear which the 939s suffer from. Whilst you're at it, get the 6th gear upgrade to get the motorway MPG up to where it should be (80mph 2500 revs) and cure the lack of any gap between 5th and 6th gear.
 

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Brera '06 2.2 JTS
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2500rpm at 80mph? Having to change down on the motorway to get an overtake done doesn’t sound like much fun.
mate, you can still drive along in 3rd gear if you want but with the upper six gear you now can get the fuel-economy which just didn't exist before. There's no difference between 5th and 6th gear anyway, so my guess is you'd stick with 5th anyway.
 

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There is a fella in Halifax, A&S Clutch technology who is very well recommended and changes all the gear cluster bearings in situ in less than a day for about £300 and all guaranteed.
His every day work is Vauxhalls but does Alfas with the same m32 box.
Where ever you are in the uk its worth considering, even allowing for the price of a tank of fuel and a night in a travelodge.
Another recommendation for this from me as well, one of the first things I had to do was get the end bearings changed out, great service from A&S.
 

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I had the gearbox rebuild, that's the new fatter 2nd generation bearings plus 2nd generation casing (with additional oil channels) and 6th gear upgrade plus DMF, done at WGMotorworks in Kent. 18 months warranty.
Done while you wait, was driving home by 3pm.
 
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