Early Bronco Power Steering Pulleys

Power Steering Pulley Considerations

When converting to power steering, you’ll need to consider the crankshaft and water pump pulleys. If your Bronco has single groove pulleys, you’ll need to switch to double groove pulleys for the power steering pump. The inside groove (closest to the motor) will handle the alternator, while the outside groove (closest to the fan blade) will handle the steering pump. Some early Broncos might have an air supply pump as part of the emissions controls running off the double groove crank and water pump pulleys. In this case, you’ll need a double groove alternator pulley to run the air pump off the alternator like the 74-77 Broncos.