ok guys,
Just recently i have this weird rattling noise coming from my exhaust, i believe, not sure though. Here is what happens. When i give it a decent amount of throttle, it makes a rattling noise, it sounds like it is coming from where the muffler is. But the noise only happens when in drive, if i rev it in park or something, no rattling. So like if im crusin down the road at 35mph and have my foot off the throttle it is fine, then if i get on it, and annoying rattling noise. Also, I have a glasspack on my truck, is it possible for something to chip of the inside of the glasspack and get stuck in there, or something came through and got stuck in there. I mean, I dont know if its an exhaust problem, but any suggestions would be appreciated. Its an 87 f-150 4.9 liter 2wd.

Thanks,
-Matt