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Vacum modulator

Discussion in 'The Garage' started by mudjunkie 82, Apr 14, 2005.

  1. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Vacuum modulator

    not much into Transmissions so I have to ask but what does the Vacuum Modulator do on a Transmission???????
     
  2. Thunder

    Thunder 3/4 ton status

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    Location:
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    Modifies the transmissions shift points in relation to manifold vaccum. Also controlls fluid pressure.

    low vaccume= (hard acceleration) it will hold the trans in a lower gear longer or downshift. For better performance.

    high vaccume= Allows normal upshifting

    Wnen they go bad or get a hole in them they hold the trans in first and wont let it shift to second.
     

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