* Gear ratios: The specific rear axle ratio significantly impacts top speed. Higher numerical ratios (e.g., 4.10) result in lower top speeds, while lower ratios (e.g., 3.55 or 3.73) allow for higher speeds.
* Tire size: Larger diameter tires will lower the top speed compared to the original equipment tires.
* Load: A heavily loaded truck will have a considerably lower top speed than an unloaded one.
* Aerodynamics: While not a major factor compared to the others, wind resistance will play a small role.
* Condition of the vehicle: Mechanical issues can affect performance and top speed.
While a manufacturer's top speed is rarely published for heavy-duty trucks like this, it's generally accepted that a 2001 F-350 7.3L, under ideal conditions (light load, optimal gearing, etc.), might reach a governed speed in the range of 70-80 mph. However, it's unlikely to exceed 80 mph, even under perfect conditions due to its gearing and aerodynamic limitations. It's more likely to max out significantly lower if heavily loaded or with taller gearing.
