I have a vibration that I suspect is a problem with the tailshaft. Took the car in for a full service, new tyres, the lot, and asked them to check the vibration. They found that 2 of the 4 centre bearing bolts were gone from one side so they replaced them. They said that they couldn't see anything else wrong with it but if the vibration is still there (which it is although not as bad as it was), then I'd have to take it to a driveline specialist. Rang around a couple of places (not Holden service centres) and have been told that Holden made the VZ SV6 with non-replaceable centre bearing & universal joints so if there's a problem, replacing the tailshaft is the only alternative. Anyone know if this is definitely correct?