what kind of transmission do i have

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by norman99, Oct 4, 2013.

  1. norman99

    norman99 New Member

    I have a 2005 Silverado LS 4x4 with a 6.0 engine and auto trans. Where do I look to see if the transmission is an Allison or not
  2. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    You can check your RPO codes in the glove box. MT1 is the 4L80e which was the standared auto at that point for the larger engines. Another possible tranny is the 4L60e which is M30 or the 4L65e which is M32. Not sure what the Allison RPO code is.

    - - - Updated - - -

    Just found the RPO for the Allison its M74.
  3. redvett

    redvett Rockstar 100 Posts

    The Allison trans is only available with the Dmax.
  4. norman99

    norman99 New Member

    Thank you. I have the MT1. I appreciate your time.

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