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  1. O

    4L80E TCC unlocking when it shouldn't

    So my 1999 K3500 7.4l L29 4l80e 4 10 rear, hits all the gears and semi locks up when it should on acceleration, then when you get out of the throttle to maintain your speed it falls out of lockup. It's like you reduced the throttle to 0 and lockup releases, but it happens about 10% throttle. I...
  2. O

    Speedometer reading while parked

    Hi all. Been looking the forum over a bit, decided to join cause I see a lot of stuff being discussed that I involve myself with, "for fun". New truck, to me. 99 C3500 dually 7.4l auto trans. Speedometer reads while parked. Goes up as high as 50mph while revving the engine in neutral, while...
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