Re: Loose muffler?
And a mechanic will charge you prob charge you 100 or more so here Ill try to help.
1. Get under the passenger side of your truck, close to the front tire.
2. Locate the cat converters and your exhaust pipe. (right next to the transmission pan)
3. MAKE SURE THE IT HAS NOT BEEN RUN IN AT LEAST AN HOUR, IT GETS UP TO 500 DEGREES ON THE PIPE!!!!!!!!!
4. The big squares along your exhaust pipe are your cats, the one closest to the engine has metal around it and has a bunch of holes in that metal. Feel the middle on the left and right side of that cat and see if it is one solid piece or if the top part has come loose.
5. If it has not come loose your problem is else where, I just suggest looking all over that pipe and shaking it at different points to locate rattle. If it has come loose you have a couple options, the simplest is to take a metal strap and place it around the whole thing and tighten it, they have straps at auto zone like a little adjustable band for 2-5 bucks. (DO NOT use anything fabric,plastic,string or anything else that will melt, remember this gets very hot).
6. Start the truck and see if you have any more noise!
I am only a backyard mechanic, anything I have told you comes from experience and I hope this fixes your problem!