I've noticed a vibration when i pull out of my driveway and when I drive and hit a bump i get a rattle like the exhaust is loose, but I install all new exhaust from downpipe to muffler. I know everything is on tight. what I also hear is humming noise coming from the drive side, i replaced the wheel hub and bearing. This sound like the mounts on the driver side, if so, should i just change all of them...your thoughts.

 

the back mount is a PITA!!!!!!!!! just warning you. Even when I had my transmission out it was a pain.

 

definitely agree the one in the back sucks to put in.

 

So i should just replace all of them or just do the front and back ones?

 

Check to make sure a heat shield is not touching the exhaust, that could be the rattle.

 

its a new Cat, the vibration does it more on reverse.