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  1. #1

    how to adjust the "adjustable" vacum modulator valve.

    it came from advance...i had to help the parts guy find it in the computer. the other parts "professional" had never seen one before either. the "destructions" only listed what parts of the plunger to remove for the vehicle application. I understand the basic concept. the adjustment screw does not "bottom" out. it turns 2 full turns then "clicks" as if it sits on a spring.. im not sure which way is for firmness and which way is for softness. moving the set screw in all the way in till right before it clicks is soft, or all the way "out" for full firmness. suggestions?

  2. #2

    Join Date
    Apr 2003
    Cincinnati, OH
    Thanked 428 Times in 258 Posts
    Turn it until it feels good for you. Really no standard, across the board setting.
    Chris D.-
    '02 Buick Century- Wife's
    2012 Jeep Grand Cherokee- Company Car/DD

  3. #3

    Join Date
    Jan 2010
    Minneapolis, MN
    Thanked 77 Times in 65 Posts
    All the way in is firm, all the way out is soft. Every one I've ever put in I went all the way in and called it good.
    1991 Buick Regal GS - 121k - 3800 SI - 440T4/4T60 - White/Silver Two-Tone - Grey Sport Interior *DEAD*
    1991 Chevrolet Lumina Euro 3.1 - 116k - 3.1 - 440T4/4T60 - White - Blue Interior *SOLD*
    1997 Chevrolet Monte Carlo LS - 180k - 3100 - 4T60-E - Torch Red - Grey Interior *TRADED*
    2002 Pontiac Grand Prix SE - 195k - 3100 - 4T65-E - Teal - Charcoal Interior *SOLD*
    1993 Chevrolet Caprice Classic - 189k - 5.0 - 700R4 - Maroon - Maroon Interior

  4. #4
    RobertISaar's Avatar
    Join Date
    Sep 2006
    Camden, MI
    Thanked 2,299 Times in 1,703 Posts
    ideally, i would start out near the full firm position, then adjust outwards until you get to what you like.

    i wouldn't go so far as to not feel the shifts though, you'll wear out the clutches REALLY quickly that way IIRC.
    King of Code
    1995 Monte Carlo LS 3100, 4T60E... for now, future plans include driving it until the wheels fall off!

  5. #5
    BXX's Avatar
    Join Date
    Aug 2006
    Lorain, Ohio
    Thanked 373 Times in 309 Posts
    I had an adjustable one in my 95 CS. I think I had it one turn from the mid point, and the shifts were nice a firm, like a good shift kit.

    However, every trans is gonna act slightly different. I would start in the mid position and go from there.
    -08 Kia Spectra SX -2.0L BetaII/Auto
    -02 Buick Rendezvous CXL -3.5L LX9 Swap/4t65e

  6. #6

    Join Date
    Nov 2006
    Thanked 3 Times in 3 Posts
    Mine was screwed out and caused hard shift from 1-2. But what was worse was when I would stab it off the line, the trans would slip, then, grab. Turned the screw in and found a good spot.

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