Well, the modulator held vacuum. I'm puzzled now. Was hoping that it was clearly a bad modulator and now I'm not sure.
What would cause this? Basically the trans is shifting the same way (early) regardless of the vacuum signal. Is there a mechanical or internal issue with the transmission that would cause this?

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".