The 3500 engine options are similar to the 2500 series: 330 hp 5.7-liter Hemi V-8 or 5.9-liter inline-six Cummins diesel. Again the six-speed manual and automatics are available. Quad cab versions have the option of single or dual rear wheels for better towing capabilities. The regular cab only comes with dual rear wheels. The 3500 version of the Ram has a one-ton rating.For 2006, the Dodge Ram 3500 is largely redesigned. It has also been modestly restyled and the interior has been upgraded.