I have seen some get a adapter made to fit the 51 tooth ofna gear on it.
With a small pinion you don't need to big of spur. 46 tooth spur with 9 tooth pinion. 5.11 ratio With the 3.31 gives you a final drive of 16.91 You could try a diff change in front and back to the 4.3 diffs.
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I got a 10 tooth pinion on it running a 1940/9 on 5s lipo. The motor and the quark are getting pretty hot. Plus, I don't need that much speed, so I was thinking of changing the gearing to run a little cooler.