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  1. C

    2004 Duramax transmission problem

    No tuning in truck completely stock, the only code it’s had was a mass air code but I’m going to plug it in today and see if anything comes up.
  2. C

    2004 Duramax transmission problem

    Hello I am new to duramax’s and this forum so look forward to learning here. I just bought a 2004 Chevrolet Duramax, 94k miles and the transmission seems to take a very long time from the 2-3 shift. It’s kinda like it’s slipping but not really. I checked the fluid which is at the proper level...