The 2009 Dodge 3500 6.7L with single rear wheels likely uses different oil in the front and rear differentials. You
must consult your owner's manual for the exact specifications. The manual will tell you the recommended type and weight of gear oil for each differential.
Failure to use the correct oil can lead to premature wear and failure of your differentials. Don't rely on general advice; use the information provided by the manufacturer in your owner's manual.
