My 05 Escalade has started to have a vibration when I accelerate to around 42-3 mph and continues to close to 48-50 mph than goes away, when I reduce speed back to this range it will start again. I have driven the car across country CA to FL with no problem till this last two months. I had replaced the tires before this started and thought that the tires my be the problem. Ihave taken them back to the tire shop and had them reballance and check for trueness of the tires. They checked out fine, the mechanicthought that it might be the Toqure converter or Transmission. They checked the trans, said it was ok. I have read the fourm and see that other people have the same problem, Has any one have a fix to this problem? GC