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Are you running 22.5s, 255s, 24.5s...? What's the final drive ratio of your transmission? Are you running direct drive (1:1), .87 overdrive, .74 overdrive...? What's your engine and displacement? You probably don't want to run the same gear ratios with a 12.8 Mercedes-Benz MBE as you would with a C15 Cat, you know? What kind of terrain are you running in? Are you doing east coast regional, 48 states, sitework...?
Seriously, you're an owner/op or going to be one, and... this?
3.55s to 3.58s tends to be a bit of a 'default'. With a .74 overdrive transmission and 22.5s, you'd be running between 68 and 70 at 1500 RPMs.
If you're running a direct drive with a 1:1 ratio and 22.5s, you'd be running 2.79s or 2.64s. Direct drive is disadvantaged in that you end up with lower starting torque, but also has an advantage in hills in that running a 1:1 transmission ratio doesn't create a parasitic drain on the engine (whereas running in overdrive does).
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