Sorry, haven't been on the forum in a while. So after everything I replaced, it was something that I had no control over. I had cluster issues and was talking to a gentleman here in southern CA about the issue when he was taking a look at the cluster, he had a similar problem on his car and found that it was the thread pattern on his new tires did not do well with the highways out here. I mulled it over and then drove the yukon from Cali to Missouri and back. Sure enough as soon as I hit good new pavement in Arizona I could take my finger off the steering wheel and the truck would drive itself. The highways out here are concrete and have grooves cut in them that run parallel with the traffic that are spaced about an 1" or 2" apart. I guess these particular tires on this truck, with crappy roads in Cali, are fond of getting trapped with that groove and since they go all over so does the truck. It has seemed to have gotten better since putting over 4000 miles on the truck in December for that trip.