* Axle ratio: Trucks with different rear axle ratios had different towing capabilities. A higher numerical axle ratio (e.g., 4.10) allowed for better towing than a lower one (e.g., 3.55).
* Transmission: The type of transmission (manual vs. automatic) affected towing capacity.
* Truck configuration: Was it a regular cab, extended cab, or crew cab? The weight of the truck itself impacts its towing capacity. GVWR (Gross Vehicle Weight Rating) is a key factor.
* Trailer type and weight distribution: The weight of the trailer, its braking system, and how the weight is distributed on the trailer all play a role.
Therefore, you cannot find a single definitive answer. To determine the towing capacity of a *specific* 1984 Ford with a 6.9L diesel, you need to consult the original owner's manual for that particular truck or check the sticker located inside the driver's side doorjamb (if still present). This sticker will list the GVWR and other important weight ratings.
Even then, the sticker may only give a general guideline. Always consider safety factors and never exceed the truck's capabilities. Overloading a truck can lead to dangerous situations.
