It will fit and will allow for larger pinions, I'm not sure how large though.
Rc-Monster also makes a center spool that holds nitro revo spurs (mod1) that allow spurs down to 34 tooth, another way to "gear up". I'll add a link in a few minutes.
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.