OK folks I must admit that I am amazed that a simple belt problem has blown up to three pages so far. Belts crap out, sometimes for no reason at all. You should carry a spare because it is an odd size/configuration.
I am very confused now with all this talk about driving without belts.
So, let me try to unconfuse my self.
TRD Supercharger System - Yes, you can drive that engine without the supercharger belt installed if you need to. That belt only drives the supercharger and nothing else. You will have a power reduction because the supercharger now becomes a restriction in the intake and you will have less than stock power. As you drive the rotors will still turn because of the air being pulled through them.
URD Supercharger System - this system uses one belt for all the accessories and the engine. You can not run the engine without the belt. The fan and water pump will not operate and you will smoke the engine. You can in an emergency, reinstall the stock belt which will bypass the supercharger and run all the other accessories and the engine will run normally, but the supercharger will become a restriction in the intake and you will have less than stock power. So, URD supercharger people, please carry a spare belt with you in the truck or at least the stock belt so you can get home if it breaks.
Gadget