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[Turk]

I've had a slight vibration on a light throttle load for ages. With the chip fitted it becomes a violent judder. No judder was fine when accelerating and decelerating, but now it can be felt when decelerating. It doesn't stop when the clutch is depressed.
Vibration stops as soon as car comes to a stand still. 
 
It's definately not wheel bearing/balance/tyre/track-rod etc related.

There is a slight crack in the rear propshaft rubber and the upper half of the centre bearing rubber has a larger gap between the propshaft and the outer edge than on the lower.

Could this be the cause of the vibration ?

[Omegatoy]

yep!!!! crack will get bigger under torque and speed, centre rubber will need doing to!!!although this will only be noticeable under acceleration or slowing down

[hoofing it]

yep!!!! crack will get bigger under torque and speed, centre rubber will need doing to!!!although this will only be noticeable under acceleration or slowing down

agreed centre bearing on prop gone better to get it fixed soon or you will end up recking the splicers on the shaft

[Turk]

Cheers mee deers 

Any ideas where best to source the end rubbers/coupling and centre bearing ?

[Turk]

Well, the petrol jobbies aren't too bad a price.

http://www.vauxhall-car-parts.co.uk/acatalog/VAUXHALL_OMEGA_PROPSHAFT_BEARING_-_90470670N.html

http://www.vauxhall-car-parts.co.uk/acatalog/VAUXHALL_PROPSHAFT_RUBBER_COUPLING_-_40_x_109_x_28._-_90222781N.html

Anyone know whether they will also fit a 2.5td.