I've got a "tinny" rattling sound when I plunk it into drive. It runs fine and everything, but it's getting a bit annoying, it's not natural, and I'm thinking I should do something about it now before it grows into a huge problem. I'm assuming it's the transmission, but what should I check first. I've got fresh transmission fluid and a flush about a month ago.

When I pull up to a red light and stop, you can really hear the sound bouncing off the car beside and it sounds a little ugly. I can't remember if it rattles in reverse, but I think it does. THe truck doesn't shake or anything, like I said it basically just sounds like something metal hitting something else. I hope I gave enough info.

 

check your cat converter, and your u joints.

 

check all your heat shields as well.