To find the correct capacity, you need to:
1. Identify the transmission type: This is usually stamped on a tag on the transmission itself. Common codes might include numbers like "SM465," "NV3500," or others. Your owner's manual (if you have it) will also list the transmission type.
2. Consult a repair manual: Once you know the transmission type, look up the fluid capacity in a repair manual specific to your truck's year, make, model, and transmission. These manuals are available online or at auto parts stores.
Without knowing the specific transmission, providing a fluid capacity is impossible and could lead to incorrect filling and damage to the transmission.