* 46RH: A four-speed automatic transmission. This was likely the most prevalent option.
* 47RH: A four-speed automatic transmission, often found in heavier-duty applications or with larger engines. The main difference between this and the 46RH is in the internal components designed for higher torque.
* NV4500: A five-speed manual transmission.
To know for certain which transmission is in a specific 1994 Dodge Ram 2500, you need to check the vehicle's documentation (owner's manual, build sheet if available) or look at the transmission itself (usually stamped with identification numbers). You can also check the VIN number and use online decoding tools or a parts store database.