Question about 2004 Ford Explorer

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Transmission bumping or "knocking"

While in motion and after letting of the throttle the transmission or the differential is making a thumping or knocking that can be felt throughout the vehicle. The 2004 auto all wheel drive in in auto when this happens and when put into 4 wheel high it goes away however it is definately in four wheel drive and is not comfortable to drive.

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  • mmoreland Dec 01, 2008

    I have the same bumpping or popping going on with my truck. I noticed it more yesterday in 4X4 HIGH. Any suggestions on how to check the transaxel fluid and does this have anything to do with it?

  • stewart_step
    stewart_step Dec 01, 2008

    Thanks for the response Bloomingidoi however, It feels to me more like "backlashing" or something not staying engaged. I'll look at the u-joint from the transfer case. Wouldn't it do the same thing in 4-high as well as 4 wheel auto



    Thanks again

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You have U-Joint out eather in the two front axles or in the drive shaft to the front axle. better have them chrcked.

Posted on Dec 01, 2008

  • Stephen  Pearson
    Stephen Pearson Dec 03, 2008

    Same thing can happen while locked in, not as much. Be sure to check u-joints on axle next to wheels.

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