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Message: <blockquote data-quote="DAM Sport Trac" data-source="post: 1047968" data-attributes="member: 76293">Just a good rule of thumb from my previous life as a tech. If you feel something in the steering wheel only it’s typically going to be something related to the front end/wheels. If you feel it in the seat of your pants it’s typically going to be found in the rear end/wheels. Driveshafts will usually shake the whole vehicle. (4wd issues can sometimes mimic a drive shaft) As previously mentioned driveshaft issues usually show at lower speeds and the vibration will increase with speed. If you have a blown out Ujoint or carrier bearing/center support it can be quite a violent shake/bounce at lower speed. In that scenario you will typically experience a clunk sound/feeling when going into gear from park if you have an automatic trans. More difficult to feel if manual trans. Bad motor mounts/trans mount can also give similar feedback but still much different feel than a bad Ujoint. Hope this helps speed up diagnosis time for someone. I don’t post much on this site as the ST is my sons truck but I do lurk from time to time.</blockquote>