thanks for the quick responses!! I am going to take the car into the shop that put the new driveshaft in and see if they can find anything wrong with the balance of the driveshaft or U-Joints. I havent really noticed any up and down or side to side vibration but ill be sure to pay attention next time. I also have a newer half shaft on the front passenger side forgot to mention that as well. Engine oil is perfect just changed the oil about 2 weeks ago and check periodically.