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The unit bearing isn't serviceable..so it can't be loose. If the big ass nut on back is moving around don't drive it...had a hub assy. lock up on me going 40+ mph couple weeks ago , scary to say the least. I wouldn't drive it without a hub.. stub will shake like crazy.
I've put eight unit assemblies on my current 00 F350 PSD over the years...if I could do it again I'd ditch the D50 or at least the non-serviceable bearing hubs and go with the Dynatrac eliminator kit.
The noise description sounds like when my buddies 01 F250 lost a front pinion bearing.. turns out his front D-shaft turned more than he knew in 2wd.
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