One problem related to catalytic convertor has been reported for the 1998 Dodge RAM. The most recently reported issues are listed below.
While driving on freeway heard a loud noise; had little power. Arrived home & vehicle was checked. Found the catalytic converter was held by small piece of welding material. Towed to dealer & mechanic repaired catalytic convertor. The problem had reappeared again. Took back to mechanic to repair.