What transmission do you have in your truck 2004 dodge 3500 with a 5.9 diesel?
A 2004 Dodge Ram 3500 with a 5.9L Cummins diesel engine could have either a 4-speed 47RE automatic transmission or a 6-speed NSG3706 manual transmission. There's no way to know for sure without checking the truck itself (looking at the transmission identification tag or checking the paperwork).