One problem related to loud engine noise has been reported for the 2002 Dodge Ram 1500. The most recently reported issues are listed below.
Driving on rt. 10 in NJ, oil pressure gauge dropped and engine made a loud noise and stopped. Barely made it to the side of the road, after almost getting rear ended. Had it towed to dealer where Dodge's independent inspector said it was the thermostat. Had engine replaced by my mechanic and was determined to be sludge build up with the pump completely clogged and the oil screen also clogged with metal fragments.