yup, do a search on this in this forum and you will see that most people who ask about gearbox problems are the 328 guys.
the 328 came with a gm gearbox and it is know to be a weak spot.
also, the 318 gearbox seems to cope better with usage.
ask any one who has driven their 328 past 150,000kms and see if they have had to do work on thier gearbox.
i personally have rebuilt mine twice. but i am pushing a lot more power through mine and i do big miles!
however, dont get me wrong, i love my 328 and would never trade it in for a 318.
power corrupts.