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Dmaxstore, Recently bought a used 2007.5 GMC CCSB Duramax with nice wheels and 285 tires. The torsions have been turned just a bit to lift for the tire clearance. I had the tires balanced to stop what I thought was a slight tire out of balance. The shake varies between 30-50mph. It has 50k miles now. Do you think the pitman arms and braces are the fix? The american tire wanted to sell me new rubber, claiming cupping. I had much worse cupping on my Ford and it drove like a dream. Any suggestions? Thanks
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