There is no gear diff option for the SX3 unfortunatley, the K1 diffs will not fit. When you say the diffs are still crunchy after rebuild did you sand the diff washers down? I also found the tungsten carbide balls are better than the supposedly better and more expsenive ceramic ones, you can set the diff a bit looser without it slipping and makes it easier to get the diff setting right. If you are using the ceramics only use a smidge of lube on them, they need next to bugger all.
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