After 2 weeks away from my Vectra I have got it back fitted with a brand new gearbox. Instantly sorted out the 3rd gear problem and the whole box feels alot smoother. Plus a new clutch too

Top marks to Stokesley Motors, my local Vauxhall dealer.

They removed my old box and stripped it and couldn't find anything wrong with it, but replaced it anyway. They and I both noticed the difference. So whether the main shaft is out of alignment on the old one or not?

This was sorted out under warranty so I would suggest anyone with a simular problem push this with their dealer.