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That is called a vacum modulator. It controls the transmissions upshift points at part throttle. It needs to be hooked to a source of timed vacum, usually off the distributor.

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โˆ™ 2005-11-17 05:33:13
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Q: What is the little diaphragm for on the back of a turbo 350 transmission?
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Which process causes the diaphragm to move back up?


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