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  1. K

    Allison 6sp: 2008 GMC 2500 Shift Problems

    Forgot to mention... when it was acting up the last time it flashed a message in the odometer area that said something about shifting to neutral to re-set....??
  2. K

    Allison 6sp: 2008 GMC 2500 Shift Problems

    Yea I've checked the fluid level and it's full. I'm thinking it has to be something electrical. When I pulled it out of the driveway this morning it went into reverse fine but when I put it in drive...nothing. I tried manually shifting it but still nothing...then when I went back to...
  3. K

    Allison 6sp: 2008 GMC 2500 Shift Problems

    I am hoping someone on this site might be able to help point me in the direction of a problem with my trans. The problem started with a random issue when accelerating from a stop and the RPM running up and then the trans slamming in gear. (almost like it was in neutral then dropped into gear)...