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Curious to hear thoughts from the 4x4 experts on this... I just had TSB 20-2307 (attached) done on my 2019 KR..basically capping off the vacuum system. I can really feel the "drag" now with the IWE's engaged full time and the CV's spinning full time. I recall the Ford Tech saying the transfer case would NOT engage until you turn your dial to 4x4 though..but I'm not sure....seems I'm reading different things.

My main concern is wear and tear on the CV's/boots etc, road noise, as well as the mileage reduction.. Still testing out, but would love to hear any thoughts on this..
 

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