I would go for propshaft, best thing to do is get it up in the air, check all joints and linkages for any movement, what I do is go to my local exhaust place and ask them to check if the exhaust is rattling, then you can hop under and say OH !! maybe its the prop and they will be helping you to find the cause!!! always works for me.
__________________ VELVET BLUE UK INDIVIDUAL , IM THE LAST
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!