Automatic Transmission Vacuum Modulator
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Pro-King Automatic Transmission Vacuum Modulator

Part No. MD-23 Warranty Details  
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Fully adjustable vacuum modulator to maintain accurate shift points.
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O.E.M. Replacement:Yes
Transmission Manufacturer:Ford
Transmission Model:C6

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4 Questions | 5 Answers
Displaying questions 1-4
  • Q:

    is this modulator adjustable?
    Asked on 1/26/2015 by no

    1 answer



      Hello No, happy to answer that question for you. This vacuum modulator is not adjustable and would be set to OEM settings. The adjustable units will more for racing and performance applications. We would need vehicle year make and model.

      Answered on 1/26/2015 by Panda from AAP
  • Q:

    I have 1975 Lincoln Mark IV, the modulator valve is not hooked in with my carburetor. Is it OK to hook it to the carburetor?
    Asked on 8/9/2010 by Anonymous from Littleton CO

    2 answers

    • A:

      Can be hooked to carb as long as the vacume tap is manifold vacume, NOT Ported (Timed vacume). To test while engine is running vacume port should pull strong vacume at idle and decrease as engine accelerates If the vacume port pulls more vacume as engine speed increases this is ported vacume. DO NOT HOOK TO PORTED VACUME. This will severely affect how your transmission shifts.

      Answered on 9/6/2015 by Fast Larry from Virginia Beach, VA.


      Should be okay to hook up just make sher it doesnt leak

      Answered on 8/9/2010 by skarakis from aap
  • Q:

    What is the difference in the color strip that goes around the top edge of the valve itself.
    Asked on 2/7/2010 by rocket from charlotte,NC

    1 answer

    • A:

      ford dealer told me that the color denotes the factory set acuation pressure in the modulator

      Answered on 2/23/2010 by weasel from brunswick
  • Q:

    Where is the Modulator Valve located on the transmission?
    Asked on 1/17/2010 by April from Greenback,TN

    1 answer

    • A:

      the modulator valve is located on the upper side (not top)of not sure if its the left side or right but it is in plain view and farely easy to access.

      Answered on 2/7/2010 by rocket from charlotte NC
Displaying questions 1-4

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