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I have a 2004 Expedition that has started a pulsing feeling and sounding like going over rumble strips. It occurs while turning left or right at low speeds such as when leaving a parking spot or turning at an intersection. The pulse frequency and loudness is growing over the past 6 months. Ford service personnel and others have not been able to identify it. And, of course, it doesn't seem to occur on test drives. I usually run it in RWD but have also had it occur in AWD. The car has about 70K miles on it. 4X4 is used, as needed, through the Pennsylvania winters. I just had to have the rear diff rebuilt which was the first sizable issue it had since the purchase in 2004. Any thoughts?


   
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Location: Oregon
where does the noise sound like it's coming from? where do you feel it at? need more info. do you feel it in your steering wheel? your brake pedal, the seat, coming from the front, left front, right front, from the rear end area? The trans or transfer case?

TSB
reference # 08-21-11, on date 10-27-08
various 1997-2008 vehicles with either 4 wheel drive or all wheel drive and equipped with control trac may exhibit a shudder on acceleration/deceleration, binding in slow speed turns or noise from the front driveline and/or transfer case. the shudder/binding may be due to incorrect tire circumference or improper tire inflation pressures.

It goes on to diagnose problems tied to this TSB. basically saying that tire circumferences must be within 1/2 inch side to side and also within 1/2 inch average between front and rear tires.


   
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I do not feel it through the brake peddle. It is felt through the steering wheel and under the front floor area on left and right sides. The car got new continental tires about a year ago.


   
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tsb says that even air pressure may cause problem. If you take it back to the dealer you might want to ask about this tsb


   
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