When I put my truck in reverse it makes a bad rattling noise only when I'm sitting still or don't have my foot on the gas does anyone know about this

 

Are your exhaust pipes hitting on the bumper or anything? My '91 used to do that, had to move them a little and now it only does it when I'm flexed out

 

No i don't think so I have a stock exhaust

 

Mine does it too. I think it is a heat shield, although I have yet to fix mine. Banging around under the truck, the shield over my passenger side exhaust seems to be the culprit.

I'll let you know if and/or how I get it fixed.

 

I started looking closer and it was the lid to my CAI so i took the lid off