I have a severe shimmy / shake that starts once I hit 60 MPH and continues till around 70 MPH. I bought this truck used with 65,000 miles on it and what appeared to be new tires. The dealership changed the tracing bar and the dual stabilizer bar and re-balanced the tires and rotated the tires also trying to fix/find the issue. The issue only seemed different before these above fixes but now appears more different , severe and worse?
The issues at first were noticed at 35 or 40 MPH crossing a rough R/R Track that near about shook me off the side of the road and then settled down but really didn’t shimmy or shake to much at a high rate of speed , this was referenced as ‘ A DEATH WOBBLE ‘. Since the above fixes , the truck don’t shimmy or shake crossing the rough R/R track at 35 or 40 anymore but now shimmy’s and shakes severely once speeds of 60 to 70 MPH are reached. Any advise would be greatly appreciated!
Vibration at 60 MPH
Generally if a vibration comes on at a certain speed and then calms down at a higher rate of speed it is caused by a tire issue. Usually the tire issue is due to balancing. Sometimes what is called a flat spot will also cause this issue.
A good way to narrow this down is to first test drive and note any vibration. Is it more dominate in the front or steering wheel than it is in the rear or seat. Once noted, rotate both front tires to the back and test drive again. Note if the vibration has followed the tires. If it is now worse feeling in the steering wheel then you can start by re-balancing. Or in most cases replacing the front tires.
More than likely all the problems that were present caused extensive damage to the tires. Now that the repairs are made the only thing left to do would be to replace the tires.