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Thread: SEVERE binding on 2-1 downshift after full manual VB mod

  1. #1
    Hybrid booster
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    Jul 2008
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    midwest
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    SEVERE binding on 2-1 downshift after full manual VB mod

    wheels try to lock up during 2-1 downshift at any speed, used the superior kit and followed those instructions plus locked shuttle valve, plugged accumulator holes in case and did the valvebody bleed mod as well.
    1-2 upshift seems fine, no binding there at all, but 2-1 is pretty bad, car tries to screetch to a stop.
    thats the only issue, how do i go about correcting this? i dont care about engine braking at all so if that goes away as part of the fix thats fine by me.

  2. #2
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: SEVERE binding on 2-1 downshift after full manual VB mod

    There is supposed to be no engine breaking really in 1st. Its just supposed to overrun, like coasting on a 10spd bike.
    I thought that was in the valve body. All of the manual valvebody cars i have do exactly as i mentioned.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.7786@113.04 mph! - Jan 15th, 2017 Fayetteville Dragway, NC)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  3. #3
    Hybrid booster
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    Re: SEVERE binding on 2-1 downshift after full manual VB mod

    did you do your own valvebodies?
    if so what all did you do to them?

  4. #4
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Raleigh Area, NC
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    Re: SEVERE binding on 2-1 downshift after full manual VB mod

    I'm afraid i am of no help.
    I had Cliff Ramsdell do my trans builds. Although, Brian recently had to refresh the one in Mini. They both had the manual valve bodies installed by Cliff.
    I don't know if it makes a difference but mine are both reverse pattern manual valve bodies.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.7786@113.04 mph! - Jan 15th, 2017 Fayetteville Dragway, NC)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  5. #5
    Garrett booster
    Join Date
    Nov 2006
    Location
    Houma, LA. '99 Neon 10.64@132
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    61

    Re: SEVERE binding on 2-1 downshift after full manual VB mod

    There is a modification done to my Killback RMVB that either allows engine braking in 1st or not by shimming one of the valves under the outer plate. I posted about it in a thread around here somewhere, or neons.org under the same user name. It may be of no help because of the different VB designs, but it may help.

  6. #6
    Supporting Member Turbo Mopar Contributor
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    Jun 2016
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    Janesville, WI
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    Re: SEVERE binding on 2-1 downshift after full manual VB mod

    Did you install the stronger spring in the shift valve and are you 100% sure the hole in the bottom of the VB is blocked off? Try putting it in neutral then back to 1st if you need to drive it that way temporarily.

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