My 76 240D transmission shifts into gear but won't move. Engine runs
fine. Is this something I could troubleshoot myself? (vacumn leak
etc.) Or is it a trip to the transmission shop (or the parts yard)?

Any advice?

thanks,

How do you know it shifts into gear?

If the transmission IS in gear the car should move, if not, the
transmission is not in gear!

I suspect the transmission is dry or its filter completely clogged or
the pump is defective. Vacuum isn't an issue when the box is as dead as
this one.
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