One problem related to brake drum wheel cylinder has been reported for the 2004 Dodge Ram 1500. The most recently reported issues are listed below.
As I was driving on the freeway at 70 mph, I heard a loud "smack!" before the engine stalled and I lost power steering and power breaks. Luckily, I'm pretty strong and was able to pull off to the shoulder. The engine would start but not turn over with 4 or 5 attempts. It started on the fifth or sixth try but would not idle. I was finally able to get it to start and on my way to the mechanic, I could tell something was broken in the engine. After inspecting the engine and looking into it, it's been determined that a valve spring broke and sent the valve through the piston and into the cylinder, effectively ceasing the engine while the vehicle travelled at freeway speeds.