* Gear ratios: The specific gear ratios in the transmission and differential significantly impact top speed. Different options were available.
* Axle ratio: A higher numerical axle ratio (e.g., 4.11:1) will result in lower top speed but greater acceleration, while a lower ratio (e.g., 2.73:1) will allow for higher top speed but less acceleration.
* Tire size: Larger diameter tires will result in a lower top speed for a given engine RPM.
* Aerodynamics: While not a major factor in a truck, even small variations in bodywork or accessories can slightly affect top speed.
* Condition of the vehicle: Engine tune, tire pressure, and overall mechanical condition all play a role.
* Load: The weight in the truck bed will drastically reduce top speed.
While a stock, lightly loaded 1960 C-10 with that engine might achieve a top speed in the 60-70 mph range, it's crucial to understand this is an estimate. It could be slightly lower or higher depending on the factors listed above. No official factory top speed was ever likely published for such a vehicle.
