thanks for all the tips, its a disc shaped bolt recessed into the pulley. for the life of me i couldn't see why they'd use a bolt that had to be removed by a torx bit 47... thats not even a common size. i'm thinkin the previous owner or shop they took it too scrounged around for a reverse threaded bolt and found one which happen to be torx. from what i've heard from some other people that own broncos is that the bolt should have been a standard hex bolt. the bolts already kinda stripped out along the outter edges. theres no way i'm gonna be able to remove it... oh well that's a project in the works i guess, i got bigger fish to fry. just found out while doing some under the truck work that one of my bushings for the radial arm is going bad. its causing the bushing washer/cap to rub against the metal causing my truck to squeak over the slightest bumps... blah