Me too....my drive way is at an angle...but my family cars do not make that clink noise.... I thought it was my rear end hitting the road...but the truck is too high even at that angle....I wonder too. Time to visit my dealer guys again.
There was a thread back about this. I had the same and it is the lsd or vsc locking. My sister lives on a huge hill and when easing up it I would hear it almost clank. So to test I reapproached the hill in 4wd and it did not happen.