Gearbox/diff disaster - Alfa Romeo Forum
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Gearbox/diff disaster

Hi there,

Happily driving my 2004 3.2 GT (less than 40,ooo miles) when I lost the clutch and ability to select any gear with the engine running. (Could engage any gear with engine off). Having recovered the car I found that the gearbox had emptied itself through the bellhousing. Simple I thought-oil seal failure...........
Sent the car to the main dealer as my ramp was occupied by another project. Problem identified as the differential letting go inside the box- upshot being that I am having a brand new gearbox fitted.
Seems strange on a car with so few miles.

Anybody else experienced this/known Alfa weakness?


Martin B
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The standard diff on the 3.2 V6 engines is well known for failing early. Your mileage is about right for when they tend to go - others have gone earlier.

The trick when replacing is to fit the Q2 diff. If your work is being done under warranty then ok, but if you're paying then..........DON'T!! Mind you if you have no specialist in NI to fit Q2 then you're stuck.

Hope you get it sorted ok.
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Sorry to hear this Martin. This is a very familiar seems that 147 GTA's are more prone than the GT or the 156. Most do seem to let go at around your mileage, mine went at just over 40,000. Unfortunately, there is often little notice of the impending failure. I was lucky in as much as my diff didn't shatter the gearbox casing. The Q2 makes a significant difference to how you car puts it's power through the wheels....and it is designed differently to the original diff, AFAIK, so it is far less likey to break..I haven't read of any Q2 failures. As long as the gearbox oil is kept topped up and the right oil is used, it should give no mechanical issues, although some people, including myself, have suffered from the odd noise being made when the system is working.
Good luck with the repair.
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Bad news Can't be many left on the original diff now..

What you need is a rebuilt gearbox with Q2 diff fitted, so it won't happen again. A brand new gearbox will go bang again in another 40k miles give or take.

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disaster , gearbox or diff

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