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Thread: 07.5 Silverado 2500 LMM 4x4 problems

  1. #1
    Join Date
    Mar 2020
    Location
    Paw Paw, MI
    Posts
    2

    Default 07.5 Silverado 2500 LMM 4x4 problems

    When I got the truck, the 4x4 didn't work. I replaced the switch, the actuator, and checked the wiring.

    Since then the 4x4 had been working, but whenever I engaged it while in drive it made a short, loud grinding sound, but it worked alright until I went to disengage it, and it made the same sound.

    Semi-recently it started to shift into 4x4, same as it was. Then when I went to disengage it, the 2wd light will flash for a minute before the service 4x4 message came across the dash. If I did the transfer case reset procedure, it would go back to 2wd until the next time I changed it back.

    Now the 4x4 won't engage at all. It says it is working, but the rear tires still just spin. No action at all in front.

  2. #2
    Join Date
    Dec 2002
    Location
    Teton Valley, Idaho
    Posts
    1,873

    Default

    Got any fluid in the transfer case?

  3. #3
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Default

    ......or the front diff?
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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