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You are correct. I had it in my mind that 2.41 was the base ratio for the diffs. But it's 2.56. (There's also 2.73 and 3.08 ) But back to the half shaft speed, no, that wouldn't change. The gearboxes are 1.92.

55mph with a tire of 36" tall means 514 rpm. 514 x 1.92 gearboxes = 987 rpm for the half shafts. That said, remember there's still the 3rd member between the half shafts and the transmission/engine. So I'll just use the base 2.41 ratio for the first trucks. That means the driveshaft/engine...