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[BigCat]

Hi everyone,

Just back from our ninth trip in VOO to southern Italy. She's developed a rear end vibration at high speed, any suggestions?

Other info, high mileage (205K), front bushes all replaced last year, one rear bearing replaced last year, New tires all round (Michelin Primacy 99 rating)

[cem_devecioglu]

personally I can think of rear wheel balance..

and its possible that one of your wheels may be buckled during the long trip..

ps: new tires can also change position during hard braking..

[PhilRich]

Swapping the rear wheels for the fronts will narrow the options. 

[markfree]

Apart from tyres your rear-end vibration could be :
   worn prop-shaft universal joint
   bent or un-balanced prop-shaft
   worn constant velocity joint
   bent/distorted drive-shaft.

Have you driven over something which hit the under-side and could have caused the above?

[Kevin Wood]

Could be propshaft centre support bearing too.

If it's only evident at motorway speeds I'd tend more towards wheel balance. Props normally are more evident at around 30-40 MPH IME. You never know, though.

Kevin

[BigCat]

Thanks for the replies, the car is with the mechanic now, but he's not an Omega specialist.

Tailshaft is the obvious one except that it only comes in at high speed. Also, it's more pronounced with a heavy load.

I don't know how the rear suspension works and if there are any bushes to check for?

It definitely only started on our return journey i.e. within the last 1.5K miles.