gear ratio

[tashpop]

they are a lower gear ratio. you'll need to increase you pinion size, and/or decrease you spur gear. there is a real nice speed/gearing calculator in the sticky section under brushless.

[lincpimp]

You can use the buggy ratio (43/13) gears which are close to the maxx gearing (37/13), than the truggy ratio (43/10). You should be able to compensate with a larger pinion or a smaller spur.