If it's in the driveshaft you will want to know before it goes! That could be an ugly mess. If certain parts like the flex discs need to be replaced, though, I understand it's not too bad a job provided you get to it before total failure occurs. You probably already know all that, though.

Hope you're able to figure out what the problem is today.

__________________
Ralph

1985 300D Turbo, CA model
248,650 miles and counting...