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I mean the differential not the transfer case. 2.56, 2.73, or 3.08

Whats your diff ratio? 2.73 or 2.56?

Transfer case doesn't matter in this case. It's 1:1 in high so I can ignore it. I have a 4l80 so it's a 0.75 overdrive but also has a locking torque converter that is 1:1 but offers Ron reduction as well.

1.92 is the geared hub ratio, I just multiplied that by the diff ratio and put that in as the diff ratio in the calculator.

Did some math, or I should restate, a website did some math. I went to a couple different engine rpm calculators to see what rpm my engine would be doing at a certain speed with certain ratios. All the ones with plenty of input data were consistent, so heres the one I used...