One problem related to diesel engine has been reported for the 2005 Dodge Ram 3500. The most recently reported issues are listed below.
2005 Dodge Ram 3500 4x4 cummins diesel engine #4 injector tube (line) cracked and sprayed entire engine compartment with fuel due to the fact that it happened wile driving the under carriage was fuel soaked also. I had it towed to a dealer for repair. Dealer said it was not covered by warranty and I was charged for repair.