2003 Ford F150

2003 FORD F-150
172,000 MILES • V8 • 4WD • AUTOMATIC
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DMURF
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  • 1 POST
My F150 has just started making a growling noise that can only be heard above 40MPH or so. As the vehicle goes faster the noise grows louder. when your foot is lifted from the accelerator the noise stops. Any ideas?
Jul 8, 2010 at 12:25 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Does the sound change when going around turns? Also, check the pinion bearing for play. It is at the end of the drive shaft where it goes into the differential. Also, check if there is any play where the front of the drive shaft goes into the transfer case.

NOTE: Place the park brake on and make sure the vehicle is secure and can not move. Then place it in neutral to remove any tension from the driveshaft.

Let me know what you find.
joe
Jul 9, 2010 at 2:00 PM
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DMURF
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I have tracked the problem to the transfer case, which at this time appears to be functioning properly. I have yet to check the fluid, which is obviously the next step. Any comments?
Jul 13, 2010 at 11:13 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Chances are one of the output bearing are bad (front or rear). Check the fluid and make sure there are no metal shavings in it. If it looks good, chances are it is one of the bearings I mentioned.

Joe
Jul 16, 2010 at 4:05 PM
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