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  1. burbn10

    shift issues m1008

    I don't know what the part number is, but I just got mine from Advance Auto Parts. Told them it was for a 6.2L K30 with a TH400 trans. It was in stock. $10. Napa has them too.
  2. burbn10

    shift issues m1008

    I believe it's supposed to be around 8" of vacuum, so it's not too far off. Just adjust the VRV back towards the air cleaner a bit to increase vacuum and that should soften up and lower the shift. TH400 transmissions were known to have a quick shift to them anyways.
  3. burbn10

    shift issues m1008

    I just fixed the identical issue. It was the VRV. I found it on Amazon.com for $85 with free shipping. AC Delco part #14057219. I'd check to see if you have vacuum at the modulator first though. High RPM hard shifts are usually caused by a lack of vacuum to the modulator, causing the governor to...
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