so i am having a similar issue, on my 05 sounds like metal on metal, but my vac lines look completely different, what year is your truck, couldnt see any breaks in the lines, but ccan you use the same trick to find leaks? starting fluid and carb cleaner to cheak for leaks?
2005 FORD F150 XLT NORTHWEST LIMITED EDITION
Oh I'm stomping the brakes, put that idea right through the fu**ing windshield.
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Sounds like your hubs
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115$ from ford. It took me about 30 mins to do each side. I had it on a lift. If your on the ground with a jack. It really shouldn't take much longer. Bolt may b stubborn. I used a little pb blaster and I didn't have a prob. But yes. Sounds like your hubs
Check to see if you're getting vacuum at the hubs first. Just pull off one of the lines from the back of the hub while the engine is running, and check for vacuum with your finger or by listening. The vacuum solenoid likes to go bad, which would lock the hubs in 4wd.
Could b that too. Top left under ur hood if I'm not mistakin. But if it's grinding like that? The hub is probably to far gone now to save it