General Motors’ latest 8.3-liter Duramax serves as evidence of this, but it’s not the only significant upgrade to the 2027 Chevy Silverado HD and GMC Sierra HD. These vehicles are also receiving rack-and-pinion steering with electric power assist, marking a shift from the hydraulically boosted recirculating ball design that has been prevalent for decades.
To gain further insight into the revamped steering system, The Drive consulted with Ken Morris, senior vice president of product integration, safety, and motorsports at GM. He simplified the reasoning behind the switch for better understanding:
“I believe [rack and pinion] provides you, particularly when towing those 38,000-pound trailers, with the exact precision of knowing your location,” Morris noted. “It’s a different spectrum from a Corvette ZR1 to a heavy-duty truck, but the objective remains the same. You want to ascertain your precise position.”
Morris continued, “The advantage is that when it’s unladen, it doesn’t significantly alter the steering characteristics. In contrast, previously, a heavy tongue weight or a load in the truck bed would change the steering feel. So, we aim for the resilience of the experience, ensuring the driver maintains 100% control.”
Rack and pinion steering diverges from traditional recirculating ball systems by employing a direct gear-and-bar arrangement for precision rather than using a threaded worm gear and ball bearings within a steering box. It has been utilized in smaller cars and even performance vehicles like the Corvette for a considerable time; it’s certainly not a novel concept. However, it is new to heavy-duty trucks, as recirculating ball steering is usually more durable with heavier weights.
GM is confident it has developed a feasible option for both the Silverado and Sierra HD. Remember, these trucks also lead their category with independent front suspension instead of a solid axle, motivated by a similar rationale: it enhances the driving experience.
“Our experience with electric power steering indicates that there’s a learning curve,” Morris noted. “When we initially introduced EPS, they had varying levels of performance, some were quite lacking. However, they have greatly improved over time. They are now so proficient that their application in the HD truck is feasible.”
GM has long prioritized comfort in its trucks, building a reputation among pickup enthusiasts. Thus, it’s no shock to witness them making this advancement before Ford or Ram. I hope the components prove robust enough to endure the substantial weight of a fully loaded dually—and Morris assures me they are.
“People often underestimate the [loads] at the connection where the tie rod joins the knuckle, and the tie rod loads can be extraordinarily high,” Morris explained. “There are variations of that load based on various factors while driving, like lateral force or other influences. EPS allows for much better management of that. You can fine-tune it [during development]. You can perform all adjustments via a laptop, without the need for physical profiles, which is time-intensive and hampers the iterative development process. You can simply input the desired specifications [with EPS].”
On the topic of testing the new GM HD pickups, Morris concluded, “I have dedicated my entire career to integration, striving for the ideal steering feel, perfect brake response, and optimal driving dynamics. … Traditionally, heavy-duty trucks tend to be quite stiff due to their high spring rates designed for hauling. This truck, when driven unladen, feels remarkably comfortable—one wouldn’t associate it as a heavy-duty vehicle if blindfolded. Once loaded, however, it’s indisputably capable. Extremely solid. The first notable difference is how the steering operates. It’s a substantial shift.”
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**GM’s Steering Innovations in Heavy-Duty Pickups for Today**
General Motors (GM) has consistently been a frontrunner in the automobile sector, particularly within the heavy-duty pickup market. As consumer preferences shift and technology progresses, GM has dedicated itself to improving the steering systems of its heavy-duty trucks to enhance performance, safety, and driver comfort. This article highlights the pivotal innovations GM has made in heavy-duty pickup steering, focusing on their effects on contemporary driving.
**1. Electric Power Steering (EPS)**
A key advancement in GM’s heavy-duty trucks is the incorporation of Electric Power Steering (EPS). Unlike traditional hydraulic systems, EPS utilizes electric motors for steering assistance, offering several benefits:
– **Enhanced Fuel Efficiency**: EPS alleviates the engine load, resulting in increased fuel economy, a vital factor for heavy-duty truck operators.
– **Improved Control**: The system provides variable steering assistance, facilitating easier handling at low speeds and better road feedback at higher velocities.
– **Customization**: Drivers often have the flexibility to modify the steering feel to align with their preferences, enriching the overall driving experience.
**2. Advanced Driver Assistance Systems (ADAS)**
GM has integrated sophisticated driver assistance features in its heavy-duty trucks, which enhance steering functionalities:
– **Lane Keep Assist**: This feature assists drivers in staying within their lane by providing subtle steering adjustments, minimizing the chance of unintended lane changes.
– **Adaptive Cruise Control**: This system automatically modifies vehicle speed to maintain a safe distance, working in conjunction with the steering system for smooth acceleration and deceleration.
**3. Enhanced Steering Geometry**
GM has redesigned the steering geometry in its heavy-duty pickups to boost handling and stability. Key elements include:
– **Optimized Rack and Pinion Configuration**: This setup improves responsiveness and decreases steering effort, making it simpler to navigate tight spaces.
– **Refined Turning Radius**: Through improvements to the steering linkage, GM has achieved a tighter turning radius, which is especially advantageous for heavy-duty trucks in confined environments.
**4. Integrated Trailer Steering Assist**
Recognizing that a significant number of heavy-duty pickup owners utilize their vehicles for towing, GM has innovated integrated trailer steering assist systems. This technology simplifies trailer maneuvering, improving safety and control:
– **Trailer Sway Control**: This function identifies trailer sway and applies brakes to specific wheels to stabilize both vehicle and trailer.
– **Advanced Rearview Camera Systems**: Paired with steering assist, these features enhance driver visibility when reversing with a trailer.
**5. Durability and Reliability Enhancements**
Considering the strenuous conditions under which heavy-duty pickups function, GM has focused on increasing the durability and reliability of steering components:
– **High-Strength Materials**: By employing advanced substances in steering components, their ability to endure the strains of heavy loads and rough terrain is ensured.
– **Sealed Systems**: Numerous GM steering systems are designed to be sealed off, protecting them from dirt and moisture, which can lead to degradation and failure.
**Conclusion**
GM’s advancements in heavy-duty pickup steering highlight its dedication to enhancing performance, safety, and driver satisfaction. By implementing cutting-edge technologies such as Electric Power Steering, ADAS, and trailer assist capabilities, GM has established its heavy-duty pickups as market leaders. As the automotive industry continues to progress, GM’s emphasis on steering innovation will likely remain vital in addressing the needs of today’s drivers.
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