I've already done this...insane power for the platform.
24/38 fit just fine and it had more than enough power, I could go to a 34T spur and whatever the biggest pinion is and still have power left. I wasn't able to get my Rustler completely set up for speed before this thing stripped a stub axle (twisted the U-joint right off). It's very heavy, but it goes like stink!
All I ever wanted was an honest weeks pay for an honest days work.