Thought so... I've tried that esc too & it's piss poor control for a ground vehicle.
An Mtronics Viper Marine 15 is one the best ever esc's I have ever used in my loader & all but one of my trks run them too. It works xllnt to control 4 wheel motors. Much finer control at a very low speed, you won't spin your wheels so easily which will give you better traction & a smoother push.
http://www.strikemodels.com/products/speed-controllers/