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    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    Thanks for the info. It’s really annoying to deal with but damn it she’s pretty
  2. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

  3. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

  4. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    Attaching some photos.
  5. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    Before I get started, I regret to inform you I’m far from mechanically inclined. I went ahead and checked on the known ground issue with the 96’s. I DO have a wire in the #23 cavity of the blue connector. See attached photo. If you don’t mind, are there other ground to look for? If so, where...
  6. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    Update, the CEL is P1870 which is Transmission components slipping.
  7. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    Also, this is my first post in the forum. If I did something wrong please just let me know and I’ll fix it!
  8. T

    97 Sierra 4L60 transmission shifts hard after driving around 30 or so miles.

    As the title states, I have a 1997 GMC 1500 with a 4L60 with 85,000 miles. The truck runs great and shifts fine up until I’ve gone around 30-40 miles or I assume gets to full operating temp. After it warms up it will shift hard from 1st to 2nd and then not as bad from 2nd to 3rd and completely...

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