Would any of you guy out there know why my 1982 300sd has such a loud downshift? When I am slowing down to stop or turn, each downshift makes a clunking noise. The upshift is hard and quick. My mechanic said that was good, but I am a little concerned about the downshift. I am clueless about this other than some mechanic who I only went to once and did not know what he was doing - was obvious - told me the valve body on my transmission was getting worn out. I just had the fluid changed and put in a can of BG transmission conditioner and new filter. No change in shifting patterns. Would appreciate suggestions.