Transmission shiting issues only in 4-Low

Discussion in 'Transmissions' started by prestoxo, Feb 18, 2020.

  1. prestoxo

    prestoxo Newbie

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    The transmission shifts normally when I am in 2 High or 4 High but in 4 Low when I put it in the OD position the tranny stays in first unless I manually move the shift lever to the 2nd gear position then it upshifts to 2nd. It will not go to 3rd though when I move the shift lever to the 3rd or OD positions. Any ideas what the cause would be? Truck is a 1996 GMC Sierra 5.7 liter automatic with the floor mounted lever for shifting into 4 wheel drive.
     
  2. BIG_KID

    BIG_KID I'm Awesome

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    The ECM needs a signal to know the xfer case is in low or it will shift funny. I would start with the sensor on the xfer case.
     
  3. prestoxo

    prestoxo Newbie

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    Thanx, I will check it out.......
     

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