High pitched noise coming from differential on a 24 Silverado HD LTZ

[Black Smoke]

Just had my first oil and filter change on my new 24 Silverado 2500 HD and had the dealer diagnose a noise in the rear of my truck. High pitched noise that sounds like it from the differential. When I speed up to 55 then coast down to 45 the noise is most noticeable. Only does it between 45 and 55. After dealer checked it out they said it’s coming from a dry bearing in the differential.  I’ve never heard of this. Could that cause the noise?  Dealers shop has part ordered. Thanks for any replies.  

[BuckWallace]

Could be. There's a whole thread regarding rear diffs on these trucks being under-filled from the factory (mine included), so that might have contributed to it. Hopefully the new part takes care of it for you!

[gemarsh]

https://www.gm-trucks.com/forums/topic/262686-check-your-diffs

[Black Smoke]

Noise issue fixed. It’s the differential. Warranty covered. 3 Bearings, gear kit, gasket, lube and seal. “Replaced ring and pinion gear set and  pinion bearings and case bearings, adjusted pinion preload to 40 in. lbs. of turning torque and adjusted ring gear backlash to .004 in and total turning torque to 55 in lbs. and reassembled and checked gear wear pattern. Reinstalled cover and filled lube.” Per invoice. 
Also replaced trailer brake controller due to recall. All was in warranty. There’s no noise now. 
07/31/2024 

Edited August 4, 2024 by Z-7124