Don't know how else to explain it. I get a blur effect with rear view mirror now around 80 mph that used to be around 90 mph. So it seems the problem is getting worse. Anyone else have this problem? How about the solution ?

 

If it's the windshield rear view mirror check the tension screw on the mount.

MikeyB

 

Driveshaft joints??!! Mine did this too, couldn't distinguish what make of vehicle was behind me using the rearview mirror due to the vibration, especially at night with the lights. Eventually, the drive shaft joints failed.

 

How do you test the u joints. I can do some wrenching, but, i am not a mechanis so unless it is very obvious, i may not be able to tell a good one from bad unless they were side by side.