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Q:

Between 30-40 mph it feels as if the front end shudders and then ok at higer mph on 2008 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had transmission fluid changed but does it more now.
(1) Answer
another thing to check is you may have an internal bulge in one of your tires.... which causes it to shudder at low speeds but once you gain speed it works its way out and the ride becomes smoother.