My Yukon drove great but had my vehicle alignment checked because I have not ever had it check before so on saturday morning first appointment and 2 1/2 hrs later it wasn't done and pulled to the right which they said they didn't know why. Took it over to Firestone across the street and they found that all the adjustments had been moved and the bolt on driver side upper control arm was loose and moving. They had it aligned perfect in under an hour !!