Bad Motor Mount.
I own a 2006 Mazda 3, just recently I had the automatic transmission rebuilt, and after I
got my car back I noticed some vibrations/rattling which had no happened before. I took it
back to the mechanic and he said that what it appears to be is bad motor mounts. The
car has been in 3 accidents throughout its life, 2 with me and one prior to my ownership.
My questions are: What could have caused the motor mounts to go bad (could it have
been something that the mechanic did seeing as there were no problems present previous
to the transmission repair), and What could happen to the car if I chose not to have the
mounts replaced.