said by sparks:well I got a busted side mirror on my van.
Order a complete replacement motor adjustable online and put it on I think it was $42.
And the mirror shakes in the housing when you hit a bump or go fast...Worst thing I have done in a while, not sure what to do now.
Sounds like the unit is not mounted properly internally. If the mirror unit was one piece with the external housing you should report it as a possible defect to the seller or manufacturer.
However, if you installed the insides (mirror glass and backing with or without motor) into your old outer housing, then recheck your work as it sounds like you didn't properly connect the guts to the housing.