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Thread: Automatic transmission shift issues

  1. #21
    Forum Newbie
    My Van(s):
    1984 + 1985
    Join Date
    Feb 2021
    Rep Power

    Re: Automatic transmission shift issues

    Hey everyone, I read all the posts and couldn't find my issue. My tranny jumps from 1st to 2nd. But, if I let off the accelerator before it shifts the reapply the accelerator after it's made the shift, it's smooth. Some other research led me to believe it could be a transmission vacuum modulator. Does anyone know if these vans have that. Couldn't find info online and when I look at my tranny I don't see anything that looks close. I do see a little port that appears to be missing something, but it's not clear how that "something" would attach. I have a photo that hopefully shows up here. Think I uploaded correctly. Thanks for any help.
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