I dropped by a mechanic friend's house and we took the truck for a spin. The noise is not coming from the rear end, but more from the area of trhe tranny. However, we drove through the problem and it stopped making the noise. Not doing it at all now. The truck has been sitting for 5+ years during restoration. It has a new clutch and clutch housing as well. The tranny wasn't torn down, but some gaskets were replaced as it was leaking. At any rate, I am going to flush the rear end and get rid of the sand before driving it anymore. The grinding noise seems to have stopped.
