Furious has got some good ideas. However, if your vibration is only occuring at a particular speed (55mph in this case) and not engine rpm (no fan theories) and only from cold to operating temp, then I would first suspsect that you've got something going on chasis and/or driveline related. I would look at tires first because they are the quickest and easiest to test. Under inflated tires will cause the problem you describe (especially in colder climates). Check the air pressures in your tires and make sure they are at the proper cold temp specification before you leave in the morning. If you don't have access to air at home, on your way home in the evening inflate the tires 7-10 psi over cold setting (less if in warmer climates). This should put them at cold spec in the morning. Give that a shot and see if your problem persists. If that doesn't work, then keep increasing the pressures slightly and note the changes. If nothing improves then you will probably have to take it in. (booger. I know) Let us know what happens. Unfortunately this is a hard one to accurately diagnose without actually driving or riding in the car.
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