The sticker will often specify the type and capacity. Common possibilities include:
* 75W-140: This is a common heavy-duty gear oil for differentials, often used in heavier-duty trucks and those experiencing towing or heavy loads.
* 75W-90: A lighter-weight gear oil, also often used in differentials.
Do not guess. Using the incorrect oil can severely damage your differential. Look for the sticker, consult your owner's manual, or check a reputable parts store using your truck's VIN number. They can look up the correct oil specifications for your specific vehicle.
