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2001 2500HD Transmission Problem

Discussion in 'Chevy Trucks' started by fedspunisher, Dec 1, 2009.

  1. fedspunisher

    fedspunisher Member
    from Iowa
    Messages: 89

    My transmission shifts really hard when accelerating fairly heavy into 2nd and 3rd. It also feels like it is slipping while at WOT. I have read this could be the speed sensor? Anyone else have any experience with this?

    I'm going to be gone for a week so i may not respond until i get back so thanks for the responses and i will fill in the blanks when i get back.
  2. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    First Q is duramax, 8.1 or the 6.0??? Need to know if it has the Allison or the 4L80E before we can get good and in depth for you
  3. fedspunisher

    fedspunisher Member
    from Iowa
    Messages: 89

    6.0 4x4 sorry left out that bit of info
  4. bike5200

    bike5200 Senior Member
    from Ky
    Messages: 437

    How many miles and when was the last time you changed trans fluid?
  5. fedspunisher

    fedspunisher Member
    from Iowa
    Messages: 89

    160,000 and i do not know when it was changed last. It hasnt been since i bought it.
  6. gmcfoo

    gmcfoo Junior Member
    Messages: 5

    First replace the trans filter and new fluid (recommend amsoil). Along with the new fluid put a bottle of Trans Tune made by Sea Foam. If this doesn't solve it then take it to a trany mechanic.