03 cl55 shakes from the rear after 110 mph
my vote goes to poorly balanced rear tires. find somebody with a hunter dsp roadforce balancer and redo the balance. it is possible you also have a bent rim which might allow the tire to be properly balanced on a normal (non roadforce) balancer and yet shake once rolling on the road under load.
if not the tires, your driveshaft my be out of balance. it will announce itself as intermittent vibration at low-speed shifts... very common on the cl and s series.
good luck
alex
few cars
Tom

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
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