One problem related to clutch pedal/linkage has been reported for the 2006 Dodge Ram 2500. The most recently reported issues are listed below.
Clutch pedal will occasionally not disengage the clutch after extended vehicle operation, particularly in hot ambient temperatures. I have experienced this problem at least 6 times since 2009; after extended driving (with or without towing, usually in warmer temperatures) the clutch pedal cannot be pushed to the floor to disengage the clutch from the flywheel. The first incident, in 2009, occurred after I stopped my truck for fuel, and resulted in vehicle movement during engine cranking when I forced the clutch pedal down far enough to engage the clutch position switch to allow cranking. The issue became repeatable enough that I replaced the entire clutch system (master cylinder, hydraulic tubing, and slave cylinder) in 2013 with the oe parts, and had the same issue occur with the replacement system.