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1st post. just bought a 2003 silverado 4x4 extra cab new of the lot. I have about 800 miles on it. My truck does the exact same thing on the freeway. Seems like it gets out of balance. I got the tow package so I'm thinkig it is probaly an add-a-leaf in the rear that is causing the bouncing. I'm gonna put a few more miles on it and see if it softens up/settles in. If it does'nt I'll pull the rear add-a leafs and repost on how it rides afterward. One other thing ,my brakes suck! 4 wheel disc and it is the worst. 1st up, feels like they need a good bleeding ,second ,no power . I would'nt tow anything in the current condition. Again ,gonna put a few more miles on it so that I can take it back with a punch list of things to fix. Your not alone.
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