The comments about the 3.23 ratio with the 10 speed tranny are, I think, valid.
GM chart says 5.3 with the 8 speed and 3.42 ratio has the same rating as the 10 speed with the 3.23.
I don't think GM in the 1500 offers anything but the 3.23 and 3.42 in gas trucks
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Rob
Bereft of TT and looking.
2020 Chevy Silverado 1500 LTZ Z71 6.2L
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