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Old 02-24-2014, 06:13 AM Rookie

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new truck, dreaded wobble, my experience

Hi all. I just bought a 2011 F250 CC 4x4 FX4 with 38K miles on it 2 weeks ago. when I test drove the truck several time, I only had it up to about 40 MPH and everything was fine. After my am commutes on a 55mph highway, I noticed when at 50 and at 65mph I get a violent shake thruout the truck, for my truck, only happens at those speeds regardless of whether or not I hit a bump first, it will start the shake on a flat smooth road and wont go away unless I slow up or even speed up. After dealing with that for a few days, I was going to schedule to have the truck looked over and alignment checked and so on at a trustworthy local shop. The guy asked me of I checked the tire pressure, and since I had not, I figured I"d better do that, the mechanic told me many of those shake issues are caused by tires, as noted on sites like this one. So this Sat I checked my pressure on all 4 tires and they were all at 58lbs. My tires are general at2 275/70r18/loadE122. So as a test I set them at 80psi cold as labeled on the tire. Since this is my first truck over a 1/2 ton I wasn't really expecting anything out of this, as my previous trucks it never seemed to matter with air pressure. I then drove the hell out of the truck on higway speeds and could not get it to shake much at all at the speeds listed above, so today to do an apples to apples comparison, driving to work the same highway, I could not get it to shake like that again. I know some trucks may have other issues, so not saying this will always work, but it sure seemed to for me. Just passin along my own experience so others may benefit as in my case turns out the tire pressure was the cause.
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