Erratic Speedo-1991 R2500 Suburban

Discussion in 'Audio, Video & Gadget Tech' started by pontiac.79, Oct 2, 2008.

  1. pontiac.79

    pontiac.79 New Member

    Here is the scoop.
    1991 Suburban 6.2 Diesel
    Automatic 4speed overdrive trans.
    139000 kms (86370 Miles).
    Drak has been replaced
    Vehicle speed sensor replaced last week.
    No engine codes.
    Wiring between VSS and body is soft but seems solid.
    My problem is during acceleration, speedo intermittently drops and fluctuates speed causing tranny to downshift, although it doesn't need to. This occurs anywhere between 45 mph up to 70, and more so during humid or wet weather.
    Any ideas or experience on this one?:grrrrrr:
  2. 95CTburb19

    95CTburb19 Epic Member 5+ Years 1000 Posts

    this type of thing happened to a friend of mine in an older PowerJoke, the tranny tried to keep up with the bouncing needle and made it shift erratically. He replaced the gauge cluster and now it shifts perfectly.

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