If you are running a 84/18 that is a final gear ratio of 11.66. Novak recomends a final gear ratio in a 4wd car around 9. that would mean you would have to run a 23,24,25 tooth pinion.
I would think these should get you close to Novaks recomendations but still continue to check temps! A Novak ss5800 is a 8.5 turn brushless. I run a 6.5 Novak Velociti in my b44.
Bumps And Jumps Rc