I still haven't had a chance to put the drive shaft in yet. Their is nothing in the bed nor is the bed close enough to make a noise. But I think I will jack it up and run it to see if I can pin point it a little better. Thanks for the input guys.
1937 Chevy (converted to 4x4) 1942 Chevy G506 1.5 ton 4x4 1958 Mack B model (on Chevy 1 ton 4x4 frame) 1969 Dodge Charger 1987 K30 Crewcab