If there is a rattling noise from a honeycomb catalytic converter there is a good chance that it will crumble and clog up. If a tray with pellets type converter rattles it is usually just a loose tray and it will work OK.

Matthew wrote:
>
> I own a 1997 Dodge Ram 1500 Conversion Van with 135,000 miles that has
> recently been making a grinding noise. Upon review, my mechanic found the
> noises were due to two unrelated problems: the transmission and the
> catalytic converter. I am having the transmission rebuilt, so my question is
> about the catalytic converter. Assuming the vehicle passes state (Texas)
> emmissions standards, is there any reason to replace the catalytic
> converter?

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Mike Walsh
West Palm Beach, Florida, U.S.A.