Grab a 54 tooth, 32 pitch spur gear for a Jato. Part number 3956.
For the pinion grab a 32 pitch, 14 tooth pinion gear. Part number 3944.
I ran that setup on a Rustler for years. The 32p gears(0.8 module) are quite a bit beefier than the 48 pitch gears that come stock. They are easier to mesh, run more true than the 48p gears and have better resistance to dirt, grime and impacts. The only downside is you cannot run the stock gear cover(but you wont need it anyways).