When you had the front end aligned, are you certain that they checked all the front end parts? Also, when you had the tires rotated and balanced, the problem stayed with the passenger front? If a tie-rod end is worn, the front tire could wobble (in and out <->) when conditions are right. The tires are constantly trying to 'track' straight ahead and the only thing that's keeping them steady/sturdy is the steering linkage. If one part is worn, then that creates 'slack' in the steering, thus allowing the tire to wobble in and out. NOW, is the tire going UP and DOWN? If so, and if it happens when you hit bumps at that speed, it could also be the shocks not holding the tire to the road. This will cause a bounce, instead of a wobble, tho. I would get a second opinion on the front end work. You can check it yourself in you want. If possible, jack the front tires off the ground and support the vehicle. Manually grab each front tire, one at a time, and shake it in and out. (Your hands should be at the 3 and 9 o'clock positions) Shake the wheel/tire in and out or left to right, and see if ONE tire moves any distance at all without the other tire moving the exact same amount. If there is slack, you'll feel it and look at the linkage and see what's moving. If you see somthing moving loosely, there's your wobble. Try that and get back with me.
Monday, June 1st, 2009 AT 4:02 PM