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2019 sierra 2500hd

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2019 sierra 2500 HD. 6.0L. Took to dealer for 4wd noise. Had truck for a month. Didn't really do much except tell me that they replaced the discontinued part. Put mirror on as it bounced its way to fully extended position. Took back in 2 weeks later when they got their Chinese parts in.  Did I say we put 4k miles on loaner. Lol. Second time in, they replaced front diff pinion bearing and the other 2 bearings they did the first time. Still grinding in 4wd is why I brought it back. 

     Month later.  Have lots of rear gear grinding. Metal shavings so far on magnetic drain plug. What's causing these bearings bushings to fail prematurely? Chinese cheap metal.? I'm sick of this stuff. 


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Sounds like the gears are not alligned/set properly. I know this stuff can be tricky and requires someone with experience to do properly. You might also consider having the metal flakes analyzed to find out what metal is grinding off. 

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