5.0 Engine Running

I check the gear lube and did not see any metal. how easy is it suppose to be to turn the pinion hub or wheel hub? I did have the brake drums off and the axle when I took that video. I also notice a clicking when I hold the diff hub and turn the wheel hub a little bit. Not sure if axle spline are worn. Attached are some pictures of rear open.
 

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  • rear 010.webp
    rear 010.webp
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  • rear 011.webp
    rear 011.webp
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  • rear 009.webp
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  • rear 010.webp
    rear 010.webp
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  • rear 012.webp
    rear 012.webp
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