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the vibration could be caused by a couple of things.one being a universal joint/half shaft needing replacing or a tire/wheel balance problem.the very odd time i have seen a balance weight for the rotor/drum come off causing an imbalance(vibration)
Drive shaft vibrations are usually associated with the balancing weights on the shaft falling off the shaft or loose mounts.
High pitch whistle and roaring sounds its best diagnosed by a technician who can put the vehicle on a lift and listed for the sounds in order to pin point the locations and determine the cause.
Vibrations of this nature are usually associated with the Drive shafts, Universal Joints, Center Support Bearing and Intermediate Spline immediately behind the Center Support. Additionally, the Sleeve Bearing in the Transmission and the Slip Yoke could also be worn. My honest opinion would be the Center Support Bearing and the Spline and Slip Yoke directly to the Rear of the Center Support. The Slip Yoke is equipped with a Grease Fitting and probably has never been Greased. The Rear Drive Shaft Section has the Male Spline and it could very well be badly worn if it hasn't been greased. Drive Shafts also have Balancing Weights which are prone to Rusting Off in our northern states where Salt is used on the roads in the Winter. Examine all drive shaft sections, U-Joints and Slip Yokes for slop and damage. This is best done on a hoist.
If this is NOT the Problem, have Front and Rear Suspension and ALL Tires checked. Many times these vibrations are caused by Wheel Bearings, Tires or worn Suspension Components.
You probably have more than one tire which is wearing out and when that happens, the sounds it makes changes too. The Escape of that year is not particularly quiet,and does have some road noise like that. But it is usually caused by the tires wearing and is normal, unless you are experiencing vibration.
You could have a worn out U joints, if your only getting the vibration during the acceleration period. Check the condition of the U joint to the drive shaft and tires. Good luck and hope this helps.
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