The amount of gear oil needed depends on the specific transmission your truck has (there were several options offered that year). You must consult your owner's manual for the correct type and quantity of gear oil for your truck's transmission. The manual will usually specify the capacity in pints or quarts.
Failing to find your owner's manual, you can try these options:
* Look for a sticker on the transmission itself: Sometimes a sticker on the transmission case will provide the capacity.
* Use a Ford parts website: Enter your VIN number to get the exact specifications for your truck.
* Consult a Ford mechanic or parts dealer: They can quickly look up the correct information using your VIN.
Using the wrong type or amount of gear oil can damage your transmission, so it's crucial to get the correct information before performing any maintenance.