I noticed that when I pull in and out of driveways and parking structures I get a creaking sound from the rearend. What could cause this? I had the car up on the lift the other day and noticed that there was duct tape on the bottom of the right coil. To my knowledge the previous owner of the car replaced the gears in the rearend because of a humming noise. Is there a chance they did not do some thing right when they put it back together?