I have a 99 Mountaineer. Recently replaced the
If it is a continuous thump (ie thump, thump, thump) that changes in speed with the speed of the vehicle it is likely related to a tire problem.
If it happens when you hit a bump or immediately afterwards it is likely due to something loose or worn out in the suspension.
If it happens somewhat randomly and doesn't seem affected by bumps it may be a loose piece of trim, or something loose under the car getting knocked around by the winds.
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