What is this rear end sound

[Usma36]

I have a 2019 1500 crew cab 5.7 hemi with 150,000 miles. I had new tires installed about 6 weeks ago. This whining sound started at the same time. It’s constant and changes in pitch depending on speed. At first I chalked it up to road noise from the tires until we had our first decent snow and I noticed the sound didn’t change at all on snow covers roads. I had rear dif fluid changed a couple days ago and the tech said the fluid was dirty but clear and he didn’t notice any metal shavings. Truck transmission shifts no problem and shifting to 4 high or 4 low seems to be working as it should with no issues. I’m hoping it’s a wheel bearing and not something major but I’ve never heard a bad bearing sound like that. I had the Mopar Max Care but of course that timed out in November. Hers the link please forgive the background noise. Dog panting in the background. Whine

 

[Robert Cyr]

If you have plenty of time and if there is no inconvenient, you could put your summer tires just for a test drive and compare the noise change. If there is no change in the sound, you'll know it's not a tire issue. Then have your wheel bearing check. Sound like your wheel bearing are shot though.

 

[Racer1_NC]

Possibly the pinion bearing...hard to tell from a video.