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  1. Chevy Silverado Forum (GMC Sierra)
    Figured I Cross post this as more of the truck guys have been into GM based transmissions I have a 07 bmw 328xi and it has the GM 6L45 transmission. First transmission had a slip bump which is notorious for the valve body causing the issue, so I did the sonnax zip kit and reinstalling I broke...
  2. GM Powertrain
    I’ve been told my transmission is going out but also that it could just be a bad the torque converter when I’m driving the rpms will go up till about 4000 put the speedometer won’t move at all it feels and sound as if I was in neutral
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