What type of transmission fluid for a 2000 Dodge 3500 4x4 diesel dually?

A 2000 Dodge 3500 4x4 dually with a diesel engine likely uses ATF+4 transmission fluid if it has an automatic transmission. However, there's a crucial caveat:

You MUST verify this with your owner's manual. The specific fluid recommendation is printed right in there, and it's the only definitive source. Using the wrong fluid can severely damage your transmission.

While ATF+4 is common for many Dodge transmissions of that era, there's a chance it might be different depending on the exact transmission installed in your specific truck. The owner's manual will state precisely what type of fluid is required for your vehicle's transmission.