This car is equipped with the 4T65E trans axle. It is suffering hard shifting. You basically feel like you went through a pot hole when it shifts into gear. If you notice the engine will rev (minor) to make the transmission shift. You feel the car jerk. I have had this inspected my 3 specialists and had the fluid and filter changed. Apparently you must have a new value body put in (about a $500 job - which is the cheapest I have found). Keep driving till it dies!