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  1. #1
    Jr. Mechanic
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    Elizabeth City, NC
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    Default 4X4 Slow to engage

    Whats up guys? I have a 97 GMC Suburban. 1500. 4x4. Here recently when I go to engage it into 4 hi it is taking a little extra time. If I have a little momentum it isn't too bad but if I am stuck and can't make any movement then it takes some time and shifting back and forth from Drive to Reverse. I live in Alaska and its still pretty cold right now so I figured something is freezing up or something. Any advice would be greatly appreciated.

  2. #2
    Jr. Mechanic Sandhopper's Avatar
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    Amarillo, Texas, United States
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    Default

    Not sure, could be a lubrication issue in the auto locking hubs. Have you ever serviced the front wheel assembly. If not it may be in order. With the cold weather the old grease in those hubs can get thick and sticky. Just a some of my thoughts...

    2010 Suburban Z71 5.3 A6, Sheer Silver, Ebony Interior

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  3. #3
    Jr. Mechanic
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    Default

    Is it pretty easy greasing those up? I honestly have never gotten into them before.

  4. #4
    Jr. Mechanic Sandhopper's Avatar
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    Default

    I have the older (88 Jimmy) hubs apart but not the 90's. They were not too bad. I am sure someone on here has had those hubs apart.

  5. #5
    Sr. Apprentice
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    Oct 2006
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    Sheldon, Iowa
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    38

    Default not hubs

    You do not have actual hubs that are locked it is in the front axle my guess is your front axle actuator is weak, common issue for that breed of truck.

  6. #6
    Legend
    murdog94's Avatar
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    Default

    Quote Originally Posted by wildmans92 View Post
    You do not have actual hubs that are locked it is in the front axle my guess is your front axle actuator is weak, common issue for that breed of truck.
    X2.
    Cleaning the connectors might help some since there might be a bit of corrosion built up in the connectors making for higher resitance, making it take longer for the signal to get thru
    Mike

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  7. #7
    Legend unplugged's Avatar
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    Default Front axle actuator

    The earlier burbs like my 93 use a thermal actuator that was very temperature sensitive. I don't recollect the exact year of the change over to the newer electronic actuator, but I believe it was 1996. Even with the newer actuator, you could still be having trouble with it and may need replacement.
    See it here: Carpartsdiscount or search OEM#: 26060073
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  8. #8
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    Default

    News to me thanks Unplugged...

  9. #9
    Jr. Mechanic
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    Elizabeth City, NC
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    Default

    Thanks for the info. Ill check it out and let you guys know what I find.

  10. #10
    Sr. Apprentice
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    Reisterstown MD
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    Default

    Quote Originally Posted by wildmans92 View Post
    You do not have actual hubs that are locked it is in the front axle my guess is your front axle actuator is weak, common issue for that breed of truck.
    How can I test the actuator? I have power to it,, but no 4wd. The indicator on the xfer case shifter also will not light up. I am assuming, (yes I know what happens when you assume) the second set of wires coming off the front diff is for the display?

    Where can I find a decent service manual for my 1996 Burb. These haynes manuals are worthless.

    Thanks,
    Tom
    1996 K1500 SLE Suburban, used but paid for:great:

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