According to my Fiat training manual both the 120-8v & 150-16v use the same gearbox-M32. No mention of the M40 anywhere!!
The 16v autobox is the same as the one on the2.4auto, Aisin AF40-6.
As the book was produced for the launch in 2005 there may be later upgrades not covered but I would doubt it was imported for long enough

.
Searches on Eurocarparts show that for the Vectra they quote "for M32 and not for M32". Needless to say the not for M32 are half the price of the "for M32" which also have a deposit cost for return of the old shaft for refurb

.
I reckon that Vauxhall have uprated the gearbox to the M40 on the Vectra 150BHP while Fiat didnt bother with our imported models.
This begs the question - what have they done with the european facelift model as regards driveshafts/ gearbox?
I await with bated breath:devil: