Thank you both for your replies. I ended up taking it to the dealership. They found nothing wrong other than improper parts and maintenance done by the place where I previously got the transmission flushed. All fixed! No more noise.
I have an issue with my truck that I'm hoping I can get help with. For reference, it's a 2017 Tahoe 4x4 5.3, with 70,000 miles on it.
The problem I have had is that when I first accelerate from a stop, I hear a severe grinding/rattling noise that seems to come from under the Tahoe. It almost...
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