TransAmGT

I had my clutch replaced right before the new year with a Spec II and the bolts that hold the PP to the Flywheel were strecthed so I had to get some new ones. My mechanic used some lock washers on those bolts but I don't recall him using any Loc-tite. Over the past month I've developed a rattle from under the car and I figured by y-pipe bolts are loose so I crawled under the car tonight and cranked on them to see and they were a little loose but not much! So I cranked the car up and the rattle was still there...and it has gotten louder and louder over the past month....is there a possiblitilty that the PP - FW bolts have backed out and that is causing the rattle? I put a screw driver up the the front of the tranny/bellhousing and put my ear to it and it seems to be coming from there! Any ideas fellas?