i have the hv maxx and run mine with 2 7 cell GP3300 packs and the motor warms up but it doesnt go above 110 degrees and the esc hasnt went over 100 degrees(i use the fan).
i run mine with a 15t pinion and 70t spur with standard size tires novak says you can run a 14-16 tooth pinion with a 70 tooth spur
andy