RC10T pinion advice

[highflier]

I have a old RC10T pretty much stock everything except Power train.

I put a Lehner 4200 basic and a bk 7018 controller in it.
For batteries 3s A123 cells.
I'll be adding a parkbec to it for reciever power. I want to run stock tires on it and on short grass. What pinion do you think I should run. I have no idea what the drive ratio is on a stock rc10t.

I have run it on the streat and it was fast, but the motor got pretty damn hot also.

Highflier