V6 auto vibrates in 3rd gear

[mattw1992]

This is very similar to what i have in my VT any further info?

 

[Immortality]

It's a special feature. Holden were trying to improve it's female customer focus.....

 

[V85000i]

My VP V8 vibrates in 3rd too, feels like Tailshaft but thats brand new. Diff is brand new truetrac, Trans was rebuilt bout 30-40,000km ago and I think its always done it. Sorry to dig a thread but thought id add another one to the tally. So maybe its just the way they are

 

[Immortality]

You could play around with the drive shaft phasing and see if that alters where the harmonics are occurring.

 

[Circlotron]

You could play around with the drive shaft phasing and see if that alters where the harmonics are occurring.

If the phasing was wrong I imagine it would vibrate in any gear, not just 3rd.

 

[Immortality]

Possibly. Vibrations tend to show up at certain speeds probably due to harmonics?

You could also look at suspension bushes in the rear. With old bushes you can have a change in the angle off the diff which would could cause issues with the drive line.