The noise started when I would give it a decent amount of gas in reverse. Its kind of like a loud "chink!" Its coming from the T-case/bellhousing area. It started getting easier and easier to simulate. I have to go forward first, then put it in reverse and go backwards. But if I go backwards, then stop and do it again, it wont do it. I have to go forward once again, and then reverse to make the sound again. Now its getting to the point where I go forward, stop, and all I have to do is shift into reverse for it to make the noise. I had a buddy get in the truck, go forward, stop, and shift into reverse. The "chink!" sound seemed to be coming from the area where the tranny hooks up with the t-case. The sound almost sounds like someone hitting a piece of aluminum with a hammer. Anyone ever seen this before?