When if at all should you replace your engine mounts. Ever since i got in my accident i been hearing noises not heard before. example my right rear wheel makes a noise like if the rotor was warped and kept tapping on the brake pad so i relpaced the rotor and pads and it still is there so i think maybe the wheel bearing is shot but when i lift the car no wiggle in the wheel. any suggestions? also after like 20 mins of driving my exhaust starts to rattle. enough that it broke the hanger that was welded to the downpipe and i had to get it rewelded. i think it the motor mounts since every thing else is tight. i think its hitting the bracket that connects the center diff to the body. anyway if i go over a bump or make left turns is when i hear it also when i let off the gas at a high RPM. its starting to drive me nuts cuz i cant figure out what it is. all the suspension underneath the car is tight. i dont have a lift so i cant really check it out as good as i want to but i did what i could. any suggestions or experience with this problem? also the dog bone behind the motor is still solid it didnt break, i thought about that first.