Slight vibration/humming noise over 75.

[markedman450]

Just picked up a 02 sport trac. Has used destination tires on it. Seems to run smooth. But once i get to 75 on the highway i start to feel a slight vibration and hear a humming noise. As the speed goes up the worse both get, once it gets below 75 it goes away again. Now i just replaced shocks because it still had stock ones on and it has 105k miles on it. Figure tires could be going bad to cause it. But what else could it be? Hub or CV Joint maybe?

 

[MidnightRebel07]

Could be u-joints, hub bearings, possibly the rearend. Where does it sound like it comes from, roll the back window down and listen, then roll just the front windows down and listen. Aslo, the vibration, is it felt in the steering wheel?

 

[03_Sport_Trac]

It could also just be the tires. Have them rotated and balanced and see if that helps. If it doesn't then I would start looking into what midnight said.

 

[markedman450]

You can feel it just a lil in the steering wheel, but can also feel it in the seat too. It feels to me its coming from the front. Im gonna move the tires around and see if it changes at all.

 

[swetrid]

Here is a tsb that might fit your concern.
Printable View (7 KB)
TSB
05-20-11 VIBRATION/MOAN DRIVING 75-80 MPH (121-129 KM/H) - 4X4 WITH 4.10 AXLE

Publication Date: October 3, 2005

FORD: 2001-2005 Explorer Sport Trac


ISSUE:
Some 2001-2005 Explorer Sport Trac 4x4 vehicles equipped with a 4.10 axle ratio may exhibit a vibration/moan condition while driving 75-80 MPH (121-129 Km/h). This may be due to a driveline imbalance condition.

ACTION:
Install a new aluminum rear driveshaft with eight (8) new attaching bolts. Refer to Workshop Manual Section 205-01 for Removal And Installation Procedure.

NOTE: IF THE VIBRATION SPEED RANGE IS BELOW 75 MPH (121 KM/H) PERFORM NORMAL DIAGNOSTICS AND DO NOT PERFORM THIS TSB.



PART NUMBER PART NAME
3L2Z-4602-AB Rear Driveshaft Assembly
N800594-S100 Bolt Kit (4 bolts per pack - 2 packs per repair)



WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATION DESCRIPTION TIME
052011A 2001-2005 Explorer Sport Trac: Install New Aluminum Driveshaft (Do Not Use With 4602A) 0.7 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
4602 D9

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NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition described affects your car or truck. Contact a Ford, Lincoln, or Mercury dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supercede this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources.

Copyright © 2005 Ford Motor Company

 

[markedman450]

Thanks man for that TSB. It starts at 80 and gets worse that faster you try to go. Im hoping its just the tires or U joints.