Not Ranked
Breaking at the track is never fun. It's costly, time consuming, and unsafe. Given the chance of upgrading while the car is down, I see no reason why one shouldn't.
But if you are sticking with street tires, and don't plan on dumping the clutch with sticky tires at the track, I see no reason why you would put in 31 spline axles. I'd be more concerned with your 3550 at this point than I would the rear. Again though, if you aren't constantly power shifting or dumping the clutch, it doesn't need replacing.
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