This may not help, but I had a 560 that had a really hard shift
from 2nd to 3rd as well. There was a vacuum line that had
fallen off. The connector was actually broken. It was at the
rear of the engine, which made it hard to see.
Check you tranny for a modulator valve and trace the hose
if so.
Good luck.
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VR
1967 250SL
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