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  1. #1

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    Symptoms of bad tranny vac. modulator?

    So, what are some symptoms of a bad transmission vac. modulator? Having a few wierd problems with my tranny as of yesterday(yeah, happened in one day, previous day it ran perfectly fine). Gonna check some vac. lines as well, make sure they are all good.

    Thanks.
    Chris D.-
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  2. #2

    Symptoms of bad tranny vac. modulator?

    A very HARD Shift would be a very wise guess....
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  3. #3
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    Symptoms of bad tranny vac. modulator?

    if it ripped, it would let trans fluid leak out and be sucked into the motor to be burned. Also harsh as hell shifts

  4. #4

    Symptoms of bad tranny vac. modulator?

    Yep, hard shifts mainly from R to 1, 1-2, and 2-1. At least that's how it was when I plugged the vac line on my 2.8.

    I suppose the opposite could happen also, really sloppy shifts
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  5. #5

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    Symptoms of bad tranny vac. modulator?

    shifts slower, revs higher. it can really make a trans act weird (many many different things)

    Chris run to an autoparts store, get an adjustable one and give it 2-3 turns in and slap it in (10 min tops) 13mm bolt
    1995 Pontiac Trans AM M6 LT1- Modified
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  6. #6

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    Symptoms of bad tranny vac. modulator?

    Hmm.... well, for anyone that has ridden in my car, my car is supposed to shift firm. Like, break the dash in half firm. But, today, it's not harsh shifting at all, and in fact feels kinda slow shifting into gears(and outta park as well), and doesn't want to shift correctly at higher RPM's.

    I think Tony and I are going to run to the parts store tomorrow morning while he is here.
    Chris D.-
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  7. #7

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    Symptoms of bad tranny vac. modulator?

    I would bet on the vac mod. remember to give it a few turns.

    $15.00 and a 13mm socket is all you will need
    1995 Pontiac Trans AM M6 LT1- Modified
    1999 GMC Sierra Z71 ExtCab Longbox 5.3

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  8. #8
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    Symptoms of bad tranny vac. modulator?

    there 20$, BUT they had to order it for me. but it wasnt my problem so i cancelled

  9. #9

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    Symptoms of bad tranny vac. modulator?

    my parts stores usually have them. if one doesn't have it move to the next one.

    your probably right 20.00 and a 13mm socket
    1995 Pontiac Trans AM M6 LT1- Modified
    1999 GMC Sierra Z71 ExtCab Longbox 5.3

    http://s22.photobucket.com/albums/b3...donburnout.flv

  10. #10

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    Symptoms of bad tranny vac. modulator?

    Me not being the great Auto person....what, just tell them you need an Adjustable one? They universal or how does it work? tell them the trans, they give you an adjustable one or regular one?....wow I feel dumb asking such an easy question... ops:
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    Symptoms of bad tranny vac. modulator?

    Basicly, Shucks convo : I need a Transmission Vacuum Modulator : what year, car, and model, : 1990, Pontiac, Grand Prix, What trim, duhh LE, SE or McLaren? :Mclaren, make sure it is for the 4T60 Transmission : ok, 21.99 or somthing, but we gotta order it


    They dont sell the original anymore, the only one u CAN get is the Adjustable one

  12. #12

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    Symptoms of bad tranny vac. modulator?

    Stupid toledo freezing cold weather, last night was insane.
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  13. #13

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    Symptoms of bad tranny vac. modulator?

    Quote Originally Posted by JakeMetz63
    Stupid toledo freezing cold weather, last night was insane.
    Yep, nice and cold and snowy as hell.

    Tony will be here around 11-ish, so we will probably run up there sometime before 3(gotta work today damnit).
    Chris D.-
    '02 Buick Century- Wife's
    2012 Jeep Grand Cherokee- Company Car/DD

  14. #14

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    Symptoms of bad tranny vac. modulator?

    Well... the tranny is acting fine now. Guess the cold weather got to it.
    Chris D.-
    '02 Buick Century- Wife's
    2012 Jeep Grand Cherokee- Company Car/DD

  15. #15

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    Symptoms of bad tranny vac. modulator?

    did you replace the vac mod? it maybe screwing up in the cold!
    1995 Pontiac Trans AM M6 LT1- Modified
    1999 GMC Sierra Z71 ExtCab Longbox 5.3

    http://s22.photobucket.com/albums/b3...donburnout.flv

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