Vacuum modulator on a manual valve body tranny???

Discussion in 'The Garage' started by yunit, Nov 17, 2003.

  1. yunit

    yunit 1/2 ton status

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    Just wondering what the purpose of the modulator is on a manual valve body tranny, since my rebuilt th400 with a manual valve body has a modulator?
     
  2. gravdigr

    gravdigr 1/2 ton status

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    To my knoweledge it serves no purpose but to keep tranny fluid from leaking out the hole. It's purpose used to be to sense vacuum and adjust the trannys shift points accordingly but with a manual valve body the automatic no longer automatically shifts.
     
  3. nvrenuf

    nvrenuf What update?? Premium Member

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    Yep, it's just plug now. Most manual valve bodies will include a freeze plug to go in the modulators hole.
     

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