Don,

You didn't mention replacing the guide rod bushings. The quality of your ride suggests looking into these. I had the same sort of issues and found they went away when I replaced those guide rod bushings. Good luck!

__________________
r2

'85 300SD 193k miles (parts)
'81 300SD 400k miles-sold
'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold