Ross, the ball diff you tried is not from a K1 which should fit. I use the ball Diffs from my original K1 no problems.
I think some of the issues people will have in trying to get a gear diff to act like a ball diff is that they work in different ways so a gear diff can never really behave like a ball diff. Ok in some situations they can be made to feel similar but when the traction isn't there nothing beats a ball diff.
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