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Scrape noise when 4wd engaged, but not when disengaged

skidoo1066

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Colorado
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2021 F150 XLT, Zone 4" + 37s
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AI/ML
'21 XLT 3.5EB
The usual story I hear about 4wd noises is that they don't disengage properly and so you get noise in 2wd. I'm having the opposite - now that it's finally snowing, when I engage 4wd I get a scraping noise. Not like grinding gear teeth, a higher pitched scrape that sounds like smooth pieces of steel rubbing (at first I thought it was a bent guard rubbing on the brake rotor until I fiddled with the 4wd). Once I get it out of 4wd the noise goes away. Note that I didn't have that problem during the summer and fall, just started now that it's getting cold.

I believe it was having trouble disengaging from 4wd when the noise started. It was night and colder when I first noticed the noise it was happening in both 4wd and 2wd, but now fiddling with it a bit during the day it only happens in 4wd.

Would love some input before I start pulling things apart (or likely paying someone to pull things apart because I hate working on cars in the cold).
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Walter Townsend

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Owner Operator Starlight Tool Services Ltd Millwright/Welder/Machinist/Electronics tech
We had that on a previous truck. It turned out to be the vacuum shifter assembly in front hub.

Fortunately it was covered by warranty and the dealer fixed it.
 
 







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