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  1. Z

    Allison 5sp: no forward gears lots of codes

    if thoughs do not fix it are the odds tranny bad
  2. Z

    Allison 5sp: no forward gears lots of codes

    2005 and no mods all stock fresh transfer case new output speed sensor on transfer and input speedsensor on tranny, it went into limp about 20 miles before pulled over to reset ran could untill pulling out of truck stop it just cluncked and will not move forward but backes up fine
  3. Z

    Allison 5sp: no forward gears lots of codes

    tranny just quit no forward gears and set off 4 codes 721 722 727 735 is tranny bad