shifting-problems

  1. AlRob

    LMM - Shift Inhibited

    I'm at my wick's end with this and come here hoping someone could shed some light on the situation for me. 2010 GMC Sierra 2500HD - 4x4 - 155kmiles - MiniMaxx Tuner on Street Tune Basically, a month ago my tranny slipped a couple of times between gears out of nowhere within a two day span. Was...
  2. 1

    Tempermental Allison

    Bought 2002 HD 2500 Duramax, there are no codes listed for trans, what happens occasionally is when it shifts to 2nd or 3rd when driving normal, there is a very short rev-up of engine rpm when making the shift. You can hear and feel a definate blip in the throttle when it shifts. It works...
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