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  1. #1

    Default 1996 GMC Suburban 4X4 issue

    My truck will not go into 4 WD. When I press either the 4 Low or 4 High there is a clunking noise and the lights on the switch just blinks. Any ideas? Tim

  2. #2

    Default

    BTW the fuse is good so I'm assuming its the ACTUATOR. Help?

  3. #3

    Default

    Usually if the lights on the buttons start blinking it means the drivetrain encountered an error while trying to switch to the requested mode.

    If possible, see if you can tell where the noise is coming from. If it's in the front it's likely an actuator.
    If it's coming from the transfer case, it could be a couple of things.

  4. #4

    Default

    I must be mistaken about the clunk. There is no noise when the button is pushed. Right now its a little cold to get out under the truck. Need to check for broken wires also.


    Quote Originally Posted by jasonlepak View Post
    Usually if the lights on the buttons start blinking it means the drivetrain encountered an error while trying to switch to the requested mode.

    If possible, see if you can tell where the noise is coming from. If it's in the front it's likely an actuator.
    If it's coming from the transfer case, it could be a couple of things.

  5. #5

    Default

    This video is exactly what you need:

  6. #6

    Default

    great video! I usually just put it in 4x4, climb under it and see if I can turn the front drive shaft by hand. If I can then the t-case is not engaging. If I can't then I pull the front actuator and check it out.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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