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Hi I have a 2010 ford raptor 5.4 engine 84k miles had it since new , I started hearing a grinding noise recently only on acceleration and it will go away like gears are grinding , what I have replaced iwe valve , selenoid, complete vacuum lines from the top to the connection to the iwe’s and both IWE’s , noise keeps happening , I lift up the truck with it running and 2wd engage and spin both front wheels and axles dont spin so at least I know iwe are working with out load and I engage awd and wheels wont spin freely by hand . Another thing grinding noise happens even on awd and accelerating . I dont know what else to ck need some ideas and help thanks
 

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Had the same issue. It was the front hubs partially engaging. You are on the right track. There is a vacuum check valve in the front hub circuit. It's bad. When you accelerate the vacuum from the engine drops. The hubs will try to engage, that's the grinding noise. The valve is a little plastic thing about $10 from ford. Replace that.
 
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