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Any ideas, guys?2000 ford explorer Eddie Bauer: from 0 to 35mph, truck drives smoothly. Starting At 35mph, there is a light fast-cycle vibration coming from the rear bottom of the truck, mainly passenger side. Vibration gets heavier as speed increases to 55 and above, though frequency of vibration does not seem to increase. When foot taken completely off accelerator, vibration completely and abruptly disappears when speed decrease reaches 45mph. Vibration does not reappear until acceleration resumes from below 35mph. Possible causes?
