Just wondering if anyone else has had this happen. I have a random noise coming out of my truck, the only way I can think to describe it is, its like dropping a peice of ready rod, or welding rod on concrete..I dont know any other way to describe it! It seems to happen randomly as well. Turning left or right, accelerating, decelerating, dosen't seem to matter! Im baffled as to what it can be! FYI, my truck is a RCSB 4x4 5.7 with a little over 36,000 miles. I just had the fluids in the diff and transfer case changed...the noise has been there for awhile now, before the new fluids, I thought maybe it was something to do with the rear gears, but they said the fluid looked fine. That was at a quick lube place, not Toyota.