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Isuzu 6spd amt gear box plays up changing 2nd to 3rd but not all the time

When changing from 2 to 3rd there is a clunk from the gear box the next day no problem happens more on level ground and on slight rises never happens down hill or slope

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  • Tiffany & Alan H.
    Tiffany & Alan H. Jan 23, 2019

    Hi, my truck is having the same problem as yours, and how do finally get yours fixed?



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  • Isuzu Master
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Check engine and gear box mounts and suspension mounts

Posted on Oct 20, 2016

  • Peter Bradley Oct 20, 2016

    well that one came from left base shall check

  • Bill Boyd Oct 21, 2016

    2nd to 3rd gear selection is the gear lever /selector pulling 2nd gear back to neutral and then selecting 3 rd gear rail and moving that gear
    the clunk could be the rail not moving properly into the neutral position before the 3rd gear rail is moved
    now why I suggested mounts is that the shifter adjustment unless the stick goes directly into the top of the box ( cable . linkage etc ) may be affected by a loose box mounting
    next the suggest may be that when the selection is made the torque reaction may be moving the gear train and the clunk is outside the box
    if the lever is direct into the top of the box then the pivot pin that the lever moves on may be loose and not affecting a proper change
    Box problems is the last thing I would suggest unless you have metal particles in the gear oil
    much unnecessary work is done when a pre investigation will reveal the problem and save time and money



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