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I have the same problem with the same growling/roaring sound when turning left at a slow speed or from a stop. the only time I heard a popping sound is when I turned sharp to hear the sound while having it in 4 wheel drive. Sure hope someone can guide us in the right direction, it sure could get...

If Modifiers don't work then why did Ford start using them in the first place, I'm sure they must have seen some benefit to it besides just trying to sell a few 4oz bottles someone.;)

I just finished replacing both front and rear diff fuilds today. One of my customers works at a Ford Motor co. research and engineering for power train for suv and trucks. He told me to use the full synth. 70-140w and friction modifier in both.

Same here HELP I am having the same problem that started a few weeks ago. I had the front right wheel bearing replaced a few months back but it was not making this noise at that time.