Yeah, there isn't. Atomik makes a ton of upgrades for it, along with RPM. I suggest whats below to start if you have the extra $. If not, stock should be fine for a while.
RPM rear hub carrier;
http://www.rpmrcproducts.com/shop/re...tler-stampede/
Atomik RC bellcrank;
http://www.atomikrc.com/collections/...slash-2wd-blue
RPM rear arms;
http://www.rpmrcproducts.com/shop/re...-a-arms-black/