2003 Ford F-150 noises in 4 wheels drive

Tiny
MHUBER
  • MEMBER
  • 2003 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
My truck only makes noises when it is in 4 wheel drive. While driving it makes a loud almost low wining noise in the front, I take it out of 4 wheel drive it is fine.
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Sunday, December 27th, 2009 AT 10:34 PM

1 Reply

Tiny
BILLYMAC
  • EXPERT
Hi
this sounds like a pinion bearing going bad. Or possibly side bearings.
But most likely a pinion bearing. Because when you engage the 4x4 you actually load the pinion bearing. And when y6ou disengage 4x4 you unload bearing, and it freewheels.

I would check the pinion shaft for looseness
thanks billymac
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Tuesday, December 29th, 2009 AT 2:11 PM

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