I usually run ceramic as they tend to wear out less than their carbide counterparts. This is especially true if you run the diff loose and the gearbox barks you will find the carbide balls get flat spots and the whole diff feels notchy and or grindy. The downside with the ceramic is because the surface is hard and they are properly round that they can slip more easily but I think even though there is this downside they make the diff nice and smooth especially in 2wd where I think it matters more than 4wd.
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