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1998 Chevy Blazer stuck in 4HI

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  • #669894
    BrandonBrandon
    Participant

      Alright so the damage on my 1998 Chevy Blazer LS is not as bad as I thought and I got it so it will drive and shift properly now.

      However now it is stuck in 4hi and will not disengage. I replaced the vacuum switch, I replaced the 4×4 buttons on the dash, the actuator seems to be alright no dry rot, rips or tears.

      Any ideas? encoder motor is all I can think of now. I need 4×4 working otherwise there is no point in keeping this Blazer.

      Also I would like to know if there is a place I can order an LSD for just the rear only I want to leave the front open diff and have the rear LSD.

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    • #669904
      college mancollege man
      Moderator

        see if this helps.

        #835165
        BrandonBrandon
        Participant

          I already watched that video, the actuator is fine no cracks, no dry rots, and the cable moves. The vacuum switch was replaced still no luck.

          However earlier today I removed the TCCM to check for corrosion which it did not have any and put it back in and now it engages into 4hi and 4lo without issues but still will not engage into 2hi.

          I might just replace the actuator next month since its the cheapest route and if that don’t work then go for a encoder motor replacement and if that don’t work then a TCCM replacement and eventually it should start working and it will all be brand new.

          #835172
          Christopher HowardChristopher Howard
          Participant

            The Shift Motor on the T-Case is either bad or you are not getting power to this motor when you command low 4wd. I would check the motor this is a pretty common issue on these.

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