Pinionsize, help please.
 

I have some problems figuring out what pinion size to use. Spur is 46T and I will be running revo/wheely king differentials (2.85:1 front and 2.93:1 rear).
Motor is a Novak Ballistic 4.5T.
What pinion should I use?

Welcome to RCM.

malfunkshun is right... we need more info... tire size, voltage, speed you want. Also, why two different diff ratios?

Look in the stickies in the "brushless" section for Speed Calculator by BrianG. You can plug in all the info and figure it out yourself.

long time lurker, first time poster actually. But thanks ^^

Wheelsize is standard Slash. 7.4v 5000mAh 35c batteries and a CC Mamba Max Pro. Speed is not the goal here, I want durability. Racing without having things overheat and die on me.
Why two diff ratios...well, I use a Revo diff up front and a Wheely King in the rear (Hardcore rear axle), but since I run a center differential it should work out fine. I can't fit a WK diff in the Revo case and a Revo diff will not fit in the axle. have tried to fins some gear with the same ratio (37/13) for the WK but no luck so far.

Will take a looksie at the speed calculator. Thanks!

Slash 4X4 diffs are 2.85. I run 13:54 with HV4.5 and temps are good, so you could be at about the same gearing with an 11T pinion and 46 spur.