Maximizing Power Steering Box Performance

Upgrading your Bronco with power steering is one of the most impactful enhancements you can make to improve its drivability. However, achieving optimal results requires that all front-end components are in excellent condition and that alignment specifications are precise. For specific alignment recommendations, refer to TOM OFFROAD’s guidelines, which we believe offer the best performance.

Evolution of Ford Bronco Power Steering

The Ford Bronco introduced the power steering option in 1973 with a 6-turn lock-to-lock steering box. This was later upgraded to a 4-turn lock-to-lock box as an option in the 1976 and 1977 models. The 6-turn steering box demands rapid hand movements for tight turns or parking at sharp angles. In contrast, the 4-turn box significantly reduces the number of turns required to maneuver the vehicle, enhancing the driving experience.

Over the years, various steering boxes have been used to convert Broncos to power steering. Some enthusiasts have even undertaken complex swaps to fit commonly available boxes. Typically, a close-ratio steering box (3.5-4 turns) is preferred by most Bronco drivers for a more responsive driving experience.

Importance of Steering Box Quality

A high-quality, well-maintained steering box is crucial for safe driving. A worn or sloppy steering box will lead to poor driving performance, even if alignment specifications are perfect and all steering components are new and tight. Conversely, a new steering box will not perform well if the linkage is loose or alignment is off. For optimal driving, every front-end and steering component must be in good condition.

Benefits of Close Ratio Steering Boxes

Close ratio steering boxes reduce the number of steering wheel rotations needed compared to the 6-turn versions. This is particularly advantageous for parking and tight maneuvers. However, quicker box reactions mean subtle wheel movements are needed at higher speeds. Therefore, following the recommended alignment specifications is essential for a comfortable driving experience.

Centering the Steering Box

For the best performance, the steering box should be "centered." The internal components are adjusted to provide the tightest and most sensitive feel at the center of the box's rotation. Ensuring the wheels are straight and the box is centered when the drag link is attached is crucial. You may need an adjustable drag link or a fully indexed pitman arm to achieve this.

Proper Steering Linkage Alignment

Proper alignment of the steering linkage is critical for optimal drivability. The tracking bar and drag link must be parallel to prevent bump steer or torque steer. If a lift kit or heim steering linkage is installed, corrective brackets may be required to align these bars. Refer to the Proper Steering Linkage Alignment guide for more details, and consult the Caster/Camber Alignment specs sheet.

Fine-Tuning the Power Steering Pump

When the steering box is in good condition, the steering linkage is tight, and alignment specifications are met, the vehicle should be comfortable and safe to drive. If further improvement is desired, adjusting the flow volume of the power steering pump can help. Most aftermarket pumps are set to flow 3-4 GPM of fluid. Reducing the flow volume to 2 GPM can slightly numb the steering feel, making it slower to react while still providing assistance. This adjustment is particularly beneficial for vehicles with smaller tires. Since the pressure remains constant, the amount of assistance remains the same, though the steering wheel may respond slightly slower under high-load conditions.

By ensuring all components are in good condition and properly aligned, you can significantly enhance the drivability and safety of your Bronco, making it a more enjoyable vehicle to drive.