O2's not working well will alter the AFR and make em stink.
Drop that cat in a bucket of hot soapy water then pressure wash the internals, what you can reach. Brings a good many of them back to life if it's soot and not poisoned.
Looks like you have it figured out. Did you run a sensor into the rear diff housing?
What sort of diff temp swings would you see towing or not? I have wondered how hot it can get
Dealer just confirmed that GM is "out of AC compressors." Not sure if all 2019 to 2026 trucks use the same compressor, but a shortage like that is hard to believe.
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