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  1. #1
    Junior Member
    Join Date
    Oct 2017
    Name
    hierarchize
    Location
    Abu Dhabi
    Posts
    3

    Gear 4x4 engaging sound

    I have a 5.4L 3v 2010 model, I have been having this 4x4 trying to engage automatically, its trying to engage and the sound is horrid, screeeching metal noice , comes on and off after I give a little acceleration,anyone know what’s the reason? Did anyone have a similar issue? And the solution..


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  2. #2
    Junior Member
    Join Date
    Jun 2017
    Name
    Greg Sullivan
    Location
    Goodlettsville, TN
    Posts
    8
    Quote Originally Posted by hierarchize View Post
    I have a 5.4L 3v 2010 model, I have been having this 4x4 trying to engage automatically, its trying to engage and the sound is horrid, screeeching metal noice , comes on and off after I give a little acceleration,anyone know what’s the reason? Did anyone have a similar issue? And the solution..


    Sent from my iPhone using Tapatalk
    Vacuum line.


    I had mine do something similar. Was a Crack in the pass side vacuum line.
    4WD is vacuum operated. When the engines running vacuum is "on" and pulls the IWEs away from the hubs. Every time you touch the accelerator, vacuum in the lines drops because it leaks out the crack in the line . When that happens the IWEs try to engage with the hubs.

    I pulled the vacuum line off the 4wd actuator on tbe brake booster and hooked up a hand vacuum pump. It didn't hold vacuum like it should have . I then hooked up a smoke machine to locate the leak location..

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    Last edited by Mystify; 10-03-2017 at 07:52 AM.

  3. #3
    Junior Member
    Join Date
    Oct 2017
    Name
    hierarchize
    Location
    Abu Dhabi
    Posts
    3
    Well I did that check and it works , just found out the sound comes from the transfer case .. 500$ work ahead.


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    ----------

    Quote Originally Posted by Mystify View Post
    Vacuum line.


    I had mine do something similar. Was a Crack in the pass side vacuum line.
    4WD is vacuum operated. When the engines running vacuum is "on" and pulls the IWEs away from the hubs. Every time you touch the accelerator, vacuum in the lines drops because it leaks out the crack in the line . When that happens the IWEs try to engage with the hubs.

    I pulled the vacuum line off the 4wd actuator on tbe brake booster and hooked up a hand vacuum pump. It didn't hold vacuum like it should have . I then hooked up a smoke machine to locate the leak location..

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Thanks


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  4. #4
    Junior Member
    Join Date
    Jun 2018
    Name
    Tommy
    Location
    Vero Beach
    Posts
    8
    Quote Originally Posted by hierarchize View Post
    Well I did that check and it works , just found out the sound comes from the transfer case .. 500$ work ahead.
    Be sure to change the fluid in the transfer case whenever it requires. Most people NEVER change the transmission, differential or transfer cases. That's REALLY BAD. They all require periodic maintenance and it's not necessarily cheap. But the good thing is, once you do it, you often don't have to do it again for a good 40,000 to 100,000 miles depending on the fluid that you put in.

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