Go with the JT chassis.. It uses a Monster pirate center with a monster truck tire friendly 65t spur gear and a slipper as an optional piece. also you should pick up some kind of 1/8 diff conversion for it. this will bring the overall ratio into a very friendly gear ratio for monster truck tires and you will then have good take off and no fried clutches.

the more I check things out.. I've heard of lots of problems about the mutant chassis from gearing to the lack of a front kickup so the front bulks don't line up all that great. Also I understand HCR is not being too friendly to the people that have gearing problems blaming everyone else for the problems and is not allowing any returns if the chassis has been assembled.