Rear diff noise? Video

Fellas!

2012 with 260k 4x4 2 piece driveshaft

This rotational squeek/chirp has slowly gotten worse but only with towing my ski boat on acceleration and maybe sometimes when i hit dips in the road a little chirp pops out.

Figured u joints, replaced all 3 with spicer, greesed, and replaced driveshaft carrier

Seemed to get better for a day! Then came right back

Changed rear diff/transfer, and front diff fluid. Rear was about 1qt low. Nothing alarming in fluid, a few normal sparkles but no metal chunks.

I've talked to a few rear end mechanics and they both never heard that noise come from a rear end.

I've scoured the truck for things rubbing and its definitely related to something spinning under load.

Heres 2 vids of the squeek.

Anyone think this could be diff? Other ideas? And no its not the spare tire.

about 6 months ago my carrier went out and the driveshaft rattled around a bit. Wondering if it could be related but theres no vibration.

https://youtube.com/shorts/X46yjk1TVdY?si=kxVqI-pqgIUs6nYT

https://youtube.com/shorts/-9-gAR78TqY?si=awjCXG_0oo2YEhUt

Thanks!