Army had a thread with pictures of the seal. The top part cannot be pulled thru, there is a pin and the crank has to be dropped. Maybe it can be done in place with the engine raised up and main bearings removed, but it's probably just as easy to pull the engine and tranny together and do it outside the vehicle. I think Leathermangs hypothesis of a leaking oil gallery plug cannot be excluded since under the engine, the oil would appear in the same place as oil leaking from a bad rear main seal. That plug should certainly be inspected when replacing the rear main seal. My failing memory tells me that many years ago a forum member had that oil gallery plug fail. I'm thinking the job would be in the $1200 range.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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