While driving under normal conditions, many drivers have noticed vibrations at certain speeds, or when stopped, or a clunking or cracking noise when shifting to drive or reverse. 


When these conditions are noticed, the engine and transmission mounts should be checked, as they are prone, not just to failure, but to physically breaking and cracking. 


In some cases, no symptoms may be noticed, but this is typically when the cracks are beginning to form, but the mount still maintains rigidity. 


Replacement of the mounts is the only option, as further damage will be caused if the mounts are allowed to remain in disrepair.