If my thoughts are right. You will find that the front diff will be 3. 55 or 3. 53 and the rear will be 3. 54. the same with 4. 10's 4. 11 or 4. 09. This is so that the front end will pull just a bit more than the rear. so air psi, tire size can effect turning or driving straight on dry roads. Also I thing they tell you not to drive on dry pavement.