Motor getting way to hot in seconds (gearing maybe?)

[Monkey]

ok ive just wired my new motor up its an 8XL when i tested it out of the car it got reall hot and smoke actually came from where the wires come out after a few seconds (dont think thats anything to worry about full throttle with no load will make it hot) so i put it in the truck thinking the load would help and it did but it still gets to hout i just drove it on and off on my drive for about a minute only small bursts of speed and going slow checking temp in between. and after a min in was getting really hot (still tuchable just) so i figure when i run it proerly it will burn its self out.

the controller dosent get noticibly hot at all and ive read that if its just the motor im undergearing it its a 14 pinion and 51 spur with super maxx gears

so im assuming (and hoping) that im way out whith the gearing so any sujestions on how i should gear it or what else it could be?