The 02 extended has developed a strange vibration, feels like I wheel is loose but that's not the case. It only vibrates between 25 and 35 mph. It doesn't matter if I'm on the throttle or coasting, it still vibrates at those speeds. I crawled under the front end and looked around, nothing seems out of place. Crawled under the back and tried to wiggle the drive shaft to check the u-joint. Everything looks good under there to me. Any ideas?