My car is at 144,000miles. It a makes loud road noise coming from the rear wheals, I have scalloping tread on the rear/right tire and there has been fluid leaking on to the inner rim of the right back and front tires. I just recently took my car in to get an oil change and the mechanic suggested replacing the front and rear shocks. Due to right rear tire tread damage. However, firestone suggested that the half shaft on the rear/right needs to be replaced. The car was also T-boned about 2.5 yrs ago on the rear/right and am now having to get my tires rotated and aligned every 6 months due to increase road noise. I am not really sure what my next move is. I know that I need to get this fixed My question is how much should this cost? What questions should I ask to make sure that I am getting the actually problem fixed? Will I need new shocks if I replace the half shaft as well? and will I need new tires after all this is done? Thanks for your clarity in this foggy situation.