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2275 on 37" tires at 1 to 1 ratio at 60 MPH indicates 4.10 gears.
Off the top of my head, I know the Dana carrier break is 4.10 up or down.
And I don't remember a break in the Sterling axle.
However I did read an article in Four Wheeler that recommended against towing heavy with rear ratios numerically above 4.10 and tire sizes above 38" due to pinion bearing failures.
unless i can find some 40's for under 1500 im gonna stick with my 37's for a while. im gonna end up (in time) goin 4.56 and arb front and rear. when ive got an extra 4k to spend that is lol. $200 for a hydroboost unit, 20 per hose and im gonna make my own brake lines. SS im sure.... ive got a list of about $14000 worth of stuff i still need to get/do on my baby. im gonna be easily 25k into her by the time im done. already over 7k into it