W124 300D vibration

[telletubby]

My 1994 estate is faultless up to about 90mph but above this speed there is some vibration through the wheel - not great but enough to make the seat belt housing rattle.
I assumed it was wheel balancing and had this checked yesterday but it was within a gnats crotchet of the norm. Anyone got any ideas/experience? I didn't have the wheels (re)-balanced.

 

[hardtop]

if you have any odd ware on any tyres ect it may give a clue to poss worn steering parts or a damper also check for worn or split joints on the propshaft or centre bearing if you have had any work done on the suspention it might be a good idea to have a four wheel tracking check done

 

[television]

Normally always wheel balancing, some firms are not good at doing it, have you tried swapping the wheels back to front

 

[telletubby]

Thanks - you're right about duff garages. I had the wheels balanced again and now it's OK.