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The Vacuum Modulator is located on the right side on the transmission just above the pan and below the two cooling lines. It should be brass colored with a 1/4" or 3/8" vacuum hose attached to it.

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12y ago

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How do you tell the difference between Chevy automatic transmissions?

Th350 has a modulator on the back. Th400 has modulator on side. 700R4 has no modulator.


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What is a diode modulator?

A diode modulator is a type of AM modulator constructed using diodes. One type of diode modulator is the ring modulator shown in the image.