stock motor gearing

[bhphoto]

if i run a modified stock motor (p2k), what would be the ideal gearing.

i do mostly jumping and other misc. off-road fooling around. the car is an electric rustler.

i currently have a 20 pinion and 84 spur. (am running the 20Turn that came with the kit and plan to switch to 27Turn)
if anyone has a good set-up, please let me know.

thanks...

[gubbs3]

I ran 18 87 with a stampede and a midnight 2.
With the smaller rustler tires the stock gearing should be good.