Volvo S70 intermittent serious vibration issue despite new tires and upper motor mount replacement on Volvo S70

Some Volvo S70 owners report experiencing intermittent serious vibration issues even after installing new tires and replacing the upper motor mount. These vibrations, particularly noticeable between 55 and 60 mph, may indicate underlying problems with the transmission system, specifically the transaxle. Additionally, improper wheel balance can still lead to vibrations at higher speeds, necessitating a thorough check of wheel alignment. Worn suspension components, such as struts, shocks, or ball joints, are also potential culprits that could contribute to the issue and may require replacement. Furthermore, some owners find that excessive road force variation in new tires can cause similar vibrations, prompting them to consider alternative tire options. If these measures do not resolve the problem, it is advisable to seek a professional diagnosis from a qualified mechanic or Volvo specialist to accurately identify and address the source of the vibration.