Worst year for the 123, for me anyway. Vacuum ONLY to the transmission. I've put a transmission from an '82 240 into a '79 sedan before, and that went perfectly. Not saying you won't be able to use the transmission from your 240D in that '80 TD, necessarily, but you may have to find the appropriate throttle linkage from another car. You'll have to get under there and look.

Jay.

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er