Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Low Vacuum at idle - harsh shift
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Old 05-29-2011, 06:58 PM
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Crosley Crosley is offline
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vacuum modulator with red and black stripe are for low vacuum application.

harsh engagement into gear can be many things:

High RPM idle with tight converter.

Cushion plates removed from forward drum

PR spring from shift kit does raise line pressure.

Do not run vacuum line from a storage tank to the trans modulator. You need direct manifold vacuum
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