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  1. chevymike

    TH400 Won't Shift

    FYI: TH400 transmissions do NOT have a lockup convertor. They always slip some. I think there was a very rare model of TH400 that had a lockup convertor but they were never put into CUCV's or I think trucks in general. Unlike a TH350 which uses a kickdown cable, the TH400 relies on vacuum...
  2. chevymike

    TH400 Won't Shift

    Might be your vacuum modulator at the trans. If that is not working, it will only allow it to shift gears at almost redline, which sounds like the engine is going to explode. I would look at replacing that first. Common issue.
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