Tbi differences 159 and Giulietta

[bonno]

Hi falconzappa.
Don't know if this helps regarding Gearbox, but I have attached links to Wikipedia detailing characteristics of the F40 gearbox. My understanding is the gearbox is designed and built in Germany for a range of vehicles including the 159. In 2007 a new version of the F40 was introduced built for the American market which had different gear ratios and detent systems.
https://en.wikipedia.org/wiki/GM_F40_transmission
The M32 6 speed gearbox was fitted to the Opel cars and very much doubt they were fitted to Alfa Romeo 159.
https://en.wikipedia.org/wiki/Getrag_F28/6_transmission

[kaleuclint]

The M32 is fitted to lots of Opels, Saabs and Alfa 159s -- unfortunately.  All 1750 manuals are M32s.  Check out alfaowner for plenty of M32 tales of woe.