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Recent content by Rex Crick

  1. R

    4l80E shifts out of OD and 4th upgrade but will not shift back on downgrade

    1999 gmc sierra 2500 4x4 6.0l with 247,500 miles. Transmission tends to have this problem when trans temp reaches 170+. Cruising at 75-80 on cruise control will cause trans to downshift normally upgrade, usually to 3rd, but will not upshift on downgrade. Stopping truck, turning off ignition...
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