'78 300D Grinding Noise in Trans

This is also posted in the Diesel Dsicussion

OK, It did it for me this afternoon! It isn't the diff. It is definetly coming from the transmission area. I started the car and it was whining when in park. When shifted to either R from P or N or from R to either P or N it made a metallic clunk, not quite grinding. When in either P or N it made a whinning sound. When I shut it down the whining sound dropped off like something free-wheeling(the torque converter?) to a stop. It was low on ATF just like when it happened for my wife.

Anyone have any suggestions? Thanks ahead of time!