[hockster]

Yup, 4 Wheel low will whine when it revs real quick.

THey all while in 4Low... Its the gearing

 

[hockster]

Sorry I should have clarified.. its 4 high that I'm getting the noise.. I've used it before and not heard a thing.. what do you think? I'm going to the dealer today to get feedback from the tech.. I'll post an update..

If its hig you are hearing the whine its a problem.. I mean you should hear a small amount just because you are turing so much more... Also, I am not sure if this has changed from when I worked there but, Ford never did NVH on the truck front drive system... So when its engaged its a bit noisy... When Ford does its NVH testing its only on the rear axle system...

 

[hockster]

What's NVH? :4-dontknow:

Sorry about that... Noise, VibrAtion and Harshness
http://www.google.com/url?sa=t&sour...L6lwf-9di7CQ&usg=AFQjCNE9pGMdWi-oQcSsKY-PypzugdHlvA&sig2=O1PdwMaGtY4Jqv1IHs1NjQ