What are you geared down too?  If not low enough, you'll probably burn out a stock clutch. (moresoinrocks)

How much HP is your motor pushing?  If much more than stock, stock clutch probably won't be enough.

If 37" MTRs are considered *big* tires, my Napa clutch has had no issues with a stock motor and 223:1 gearing.    Been 2 years so far with 37", 5+ years with clutch in the truck.