A bad front or rear typically wouldn't cause a vibration depending how bad they are while driving. Front and rear mounts are usually roll stoppers which means they're main job is to hold everything in place from moving front or back. Putting a car into drive or reverse is a big load because you're engaging the transmission at that point and torques the engine which may be your cause of the clunk. Check your engine mounts and let me know what you find.
Thursday, April 30th, 2015 AT 7:10 PM