Are the driveshafts from 84 300d and 84 300td interchangeable. I have access to one I need for a bad one in my 84 300d.

I would think yes, but cannot say for sure.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I think the wagon has a longer drive shaft... but I have not put them side by side myself, so I do not know.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I too am not sure. If you can locate any literature indicating the sedan and the station wagon have identical wheelbases then it is fairly safe to assume the same driveshafts. I have never heard anyone mention the wagon has a longer wheelbase myself.
With a little luck someone will have the answer for you soon.

I've got an original set of service manuals for the W123's and although I cannot tell if you can switch driveshafts, I would have to say your chances are good! According to my books, both the 300D and the 300TD both have a wheel base of 2795cm or 110 inches. The only thing I can think of is with the wagon, you could have a difference in centre shaft support, but you would have to remove it and lay them out side by side. Hope this helps.