* 48RE: This is a four-speed automatic transmission. It was the more common transmission in the 2005 model year.
* NV5600: This is a six-speed manual transmission. It was a less common option, but still available.
To know for sure which transmission is in a specific 2005 Dodge Ram 3500, you need to check the vehicle's documentation (owner's manual, window sticker, etc.) or look at the transmission itself.
