I'm driving a 210 on carpet with a gear diff, have tried 2000 (for several months), 3000 and am now on 5000cst. Will probably pop some 7000 in for next time i drive. Each time i stiffen the diff up, it gets better.
I just ran 2000 outside last summer (Astro track)
It's not been an issue up to now, as my driving has been so poor!
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