I have a very loud exhaust rattle coming from under the cab after I put my automatic tranny in gear. Doesn't matter if it's "drive" or "reverse". Seems to happen mostly when the engine is cold but will still do it when warm as well just not as often. Also goes away when I accelerate.
Is there a "common" part that is causing this? Plan on getting underneath to check it out in the morning but just wanted to see if there was something I ought to be looking at first before I waste my time looking in the wrong areas!