* 4-speed automatic: This was the most common transmission.
* 5-speed manual: Less common but available on some models.
You must check your vehicle's documentation (owner's manual) to determine which transmission you have. The owner's manual will specify the correct transmission fluid capacity for your specific Durango. You can also find this information on a sticker usually located under the hood or on the driver's side doorjamb.
Without knowing which transmission your 2001 Dodge Durango has, it's impossible to give you a precise transmission capacity.