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I forgot about the transmission- yes that gets connected to the manifold port as well, the vacuum modulator.
I believe that the accumulator supplies the cabin vacuum. This is so stuff works after the engine is shut down. This does the E-brake release, the vacuum motors to the rear window vent, AC controls, and the door locks (may be others depending on options). The E-brake release is connected through a valve in the neutral safety switch.
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