At the transmission, I have the clamp's little 10mm loosened. (I can see a few threads under the washer on top of the little clamp.) I stuck a flat-head screwdriver into the clamp to try to pry it apart, although I don't think that did much.

EDIT: I guess I'll have to access the clamp from the rear through the transmission support and completely remove the screw.
I have it up on a ramp stand on level ground now, so I have much better access to it.

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1982 300CD Petrol/Black Leather