I have used the 35A without the fan in a Vendetta SC with a 2835 size motor and it never felt any warmer than before I ran, but I can't say for sure since the Traxxas weighs more and your motor will draw more current. The only damage would come from heat, so as long as you keep an eye on the temp you will not have any issues. In my experience these ESCs have been very robust so you should be fine.