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What is the differences in the 2004.5 and the non 2004.5? I had a 1998.5 , it was a 24 valve with EFI instead of the 12 valve motor with standard injection, I loved that truck but needed a long bed and moved to Oregon where I really needed a 4 WHD so I bought a 2006 3500 4 WHD single wheel four door with the automatic, it rocks towing and non towing. It is my daily driver now. Is your motor the high output or ths standard motor? I have been told by several people I trust that the 2003 and 2004 get better mileage than the 2006 do I have a freind that had a 2005 4WHD 3500 dually with the automatic that towed his race car trailer, enclosed 24 Ft Pace Shadow and he had a 12.5 camper on it usually, I couldn't outrun him on the hills here in Oregon with my truck and same trailer with no camper on my truck It is really fun passing the other brands, especially the V10, on the hills

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2003-2004 don't have the pre shot of fuel which I think were done to aid in quieting the engine down on later 05+ hence the reason for better fuel mileage.

4.5s have an external fuel pump and 05+ are in tank I believe.

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This one has had the pump relocated in the tank I believe...atleast thats what the former owner said