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Problem allison in duramax 4500

Discussion in 'Chevy Trucks' started by FARM, Aug 1, 2006.

  1. FARM

    FARM Junior Member
    from CT
    Messages: 1

    transmission will only shift when i let of the accelerator. if i keep my foot on the accelerator truck will not shift, it will just stay in one gear until i take my foot of the pedal. it's a '03 4500. i bought the truck used about a year and a half ago. would this be covered under warranty? any suggestions?

    thank you
  2. cet

    cet PlowSite Fanatic
    Messages: 7,257

  3. qualitylandscap

    qualitylandscap Member
    Messages: 83

    I that problem with an 06 with the new 6 speed auto tranny, when I was using it I drove it in M so I could shift the truck. Well I had the pedal down to the floor then went to push the button to shift the gear nothing. I had to let off of the pedal to shift.

    TRUE TURF LAWN Senior Member
    Messages: 290

    i had this problem in the winter when it got rally cold, but now its summer and its fine. the guys at the dealership said i was not the only on with this problem. see i could not even drive it in M it just would not shift and plus my check engine light would come on.