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[Darth Loo-knee]

I have always been told that any shaking above 50-60 mph will be the rear wheels.
Could be balancing.
In my case it was rear wheels with slight buckle I could feel the slight shake through my seat, which wasn't to unpleasent I must say

[Jimbob]

I would get the wheels balanced 'properly'

get them to use the studs, not centre hole, meant to be more accurate.

and get them to run it up to speed again, until it says no more needed.

one of my buckled wheels was run 9 times before the machine said it was balanced....and it is perfect for the entire speed range 

just need an outfit prepared to do it properly.

after seeing it done properly at Wheels in motion, I now know where the other places had been going wrong 

[Richard A]

If it doesn't happen when you brake it is 'worn suspension parts' !!!!!!
Steering idler, track rod ends and 'yes' check the wishbones bushes as you say it pulls to a side 

regards
richard a

[mowerman71]

mine does the same thing at 79/85 , been told the rear wheels cause this , had them balanced , all sorted

[Richard A]

'MIGGY 24' said "I can fill it through the steering" so the problem is at the front,
if you feel it up through the 'front seats' the problem is at the rear - of the car 

regards
Richard A

[bigdods]

Could be a slightly bent alloy. I had a badly egg shaped one and it caused all sorts of odd vibrations that came and went.  You need to go somewhere like WIM where they do a decent job of balancing and can diagnose this kind of thing.

This egg shaped wheel had already been balanced and checked twice by one of the leading fast fit places before I took it to WIM and they found the problem immediately.

[jemis]

I've had 6 omega's and every one has had some sort of vibration at some speed or other, found different faults on different cars but only cured it once with brake disc's. I have made it better also by changing bottom arms I have also changed them twice in a year after buying some cheap of ebay after a few months they started pulling to the right under braking as the front bushes where to weak. This could be your problem.

I have found with Omega's its worth paying more for quality parts, disc's bottom arm's, steering idler etc.

I fitted an aftermarket steering idler in feb and it failed it's mot on it in august so now has a GM one fitted.

Hope this is of some help.