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modulator adjustment?

Discussion in 'The Garage' started by bigbadchev84, Mar 27, 2006.

  1. bigbadchev84

    bigbadchev84 1/2 ton status

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    how do i adjust the vacuum modulator on a th400?
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Assuming you have an adjustable modulator you use a small screw driver and turn the screw that is inside the vacuum fitting. Make small adjustments at a time.
     
  3. bigbadchev84

    bigbadchev84 1/2 ton status

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    ok well i got that part but what i meant was what happens to the shifting when i turn th screw in? out? thanks
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Can't remember which is which but one way will make the shift later firmer and the other will make it earlier and softer.
     
  5. diesel4me

    diesel4me 1 ton status Premium Member

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    in ----out....

    Turning the adjusting screw IN makes it shift a bit harder and later..turning it OUT makes it shift softer and earlier...you'll only get a range of about 10-15 mph difference at what speed it shifts at,and only a firm shift if you crank it IN ,there isn't a huge difference really..

    I read your other post...sorry its the direct clutch,I was hoping it was something easy and cheap for you to fix..:(
     

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