I'd go 4.88. When I do the math, 35/28 x 3.73 = 4.66
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The only difference in the math was the tire diameter, I used 29 you used 28. A 235/75r15 comes in at 28.9" which I rounded up to 29. Both ratios would be better than the stock 3.73 but the 4.56 will be a bit stronger.