How do you fix Catalytic Converters for a 1999 Ford F-150 Truck?

The Fords mostly have problems with the converter rattling inside. This is usually because the catalyst inside breaks down. The only way to fix a converter if this happens is to replace them, probably about $600.00-1000.00 or so depending on engine size (most have 4 converters). Find out what damaged to old converters (check o2 sensors etc) otherwise the new converters may suffer the same fate. Also check the rest of the exhaust to make sure that there is no catalyst pieces stuck in the pipes or muffler as this will restrict the exhaust flow causing other problems.