Truck shakes sometimes under 30 mph

[johnbjr]

My bronco shakes sometimes under 30 mph it feels like im offroading over a bunch of small bumps. It doesnt do it all the time but when it does I have to come to a complete stop then go again and usually it will stop. The stearing doesnt feel loose. I have no clue where to start with this problem. Any suggestions?

 

[TX_BEAST]

you got a lot more replies on fsb, but ill tell you the same. mine used to do the same thing and it turned out being track bar bushings. i put in polyurethane and fixed the problem.