What does a high numerical axle ratio (3.8 to 4.0) provide for towing?

A high numerical axle ratio, such as 3.8 to 4.0, significantly influences the towing capabilities of a vehicle. Specifically, these higher axle ratios are designed to provide more pulling power, which is crucial for effectively handling heavy loads. This increased pulling power comes from the way the gearing works; it allows the engine to generate more torque at lower speeds, making it easier to start moving a loaded trailer or climb steep grades.

However, this configuration typically results in lower fuel economy. Since the engine has to work harder (i.e., operate at higher RPMs) to maintain speed with heavier loads, it consumes more fuel. Therefore, when considering the balance between towing capability and fuel efficiency, a high numerical axle ratio excels in providing robust pulling power but tends to compromise on fuel economy.