Two problems related to catalytic convertor have been reported for the 1997 GMC Safari. The most recently reported issues are listed below.
The honeycomb catalyst material is broken and can be heard to be rattling around within the catalytic converter. The catalyst within the housing will further deteriorate, break apart, and migrate into the muffler. Since the muffler is not shielded as well as the catalytic converter, this presents a very real fire hazard.
Catalytic converter failed.