The quadshock should not make any noticable difference in the compression of the body (when you push down on the car). If you were not having any compression/rebound issues (and it was just a noise you were after), then it sounds like you found the issue.
If you have funky rebound/compression, ensure the shock is bolted up at both ends and check for oil leaking down the body.
no problems when i pushed down id just hear a click noise... this was the problem... i had the right size bolt in grade 8 in the garage... problem solved!