What motor you running and what fdr does it need? Get one or two pinions either side of that so you can tune for the track. For instance, I "need" a 23 to hit the fdr on my 4wd, I've got 21 through to 25. (Plus a shed load more if I use a different motor or spur.......Or car!)
Yes, 48DP for almost all buggies.
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