Again just my opinion......
4.88:1 would give you more torque and get you back to about a stock overall ratio if you have changed out the 285's for 315's. I like the idea of a 4.88 or maybe even a 5.12ish ratio with 315's. On the other hand there is the possibility that a lower ratio (higher numerically) would be easier to break.
In either case I personally would wait and see if more differentials break because it's under warranty now and once you install aftermarket parts the warranty is gone. If it ends up being a bad gear issue and not related to the differential itself then upgrading is probably a safe beat. If on the other hand it's related to the differential I would not want to change anything.
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