I was running 4.10s with 31s in my old XJ (auto). You will be fine. No issues. Gas mileage will get better. I am running 4.88s with 33s in my current TJ.
What vehicle are you running? Just get a set of axles out of a 4cyl XJ or TJ, they come with 4.10s from the factory. The front will bolt right up. You will need to get a new axle bracket kit for the rear if you get it out of a TJ.
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