I have a 2005 Yukon XL SLT with 285,000 miles on it, I started getting pretty nasty vibrations up front. So I had my pitman and idler connections replaced because they were REALLY worn, I also got 4 new Firestone Destination AT tires mounted and balanced. These two repairs fixed the vibrations perfectly and now it rides smooth. But, upon getting an alignment and everything now my steering pulls right and the steering wheel is a little off center. As soon as you correct the steering wheel (puts it at about 11 o'clock) the truck tracks perfectly. I took it back to the mechanic and after taking it for a test drive he gave me the explanation that because I replaced the idler and pitman connections and connected them to a steering box with 285,000 miles on it the parts may not mesh 100%. Does this make sense or was the mechanic just avoiding more work? I gotta believe that you can out the steering wheel back to 12 o'clock somehow. Will it possibly get better as the connections wear a little bit, or is my steering just going to get worse? It sounds like its gonna get worse. Any insight on the issue would be greatly appreciated. Thanks!