GMC Safari front end shaking while driving on freeway after rear main seal replacement on GMC Safari

Some GMC Safari owners report experiencing front end shaking while driving on the freeway after replacing the rear main seal. This issue may be attributed to several factors, including problems with wheels or tires, such as unbalanced tires or uneven wear that can cause vibrations at high speeds. Additionally, some owners have noted that suspension system problems, particularly worn or damaged shocks and struts, can lead to similar shaking between 60 and 80 mph. In some cases, improper installation of the rear main seal or defective components may also result in vehicle vibrations. Furthermore, misalignment of the wheels, potentially caused during the repair process, can contribute to this shaking at higher speeds. To resolve these concerns, it is recommended that owners consult a professional mechanic for a thorough inspection and appropriate repairs to ensure both safety and vehicle performance.