GM to Offer Four Wheel Steering Option in Full Size Truck for 2002 Model Year.

General Motors announced it will be the first manufacturer to offer an optional four-wheel steering system on a full-size truck product. Delphi Automotive’s innovative QuadraSteer™ four-wheel steering system will debut on a future GM full-size truck in the 2002 model year.

In GM and Delphi testing on full-size pickups and SUVs, QuadraSteer reduces the minimum turning circle diameter by an average of 20 percent. In fact, one GM full-size truck’s turning diameter was reduced from 46.2 feet (14.08 meters) to 37.4 feet (11.40 meters), making it comparable to a Saturn Coupe’s turning diameter at 37.1 feet (11.31 meters).

In addition, this technology gives added control to drivers that trailer. During low-speed towing maneuvers, such as backing into a boat launch or parking a camper, QuadraSteer greatly improves the trailer response to steering input.

How QuadraSteer Works

QuadraSteer is an electronic rear-wheel steering system that supplements the conventional front-wheel steering system. It allows for greater maneuver-ability while driving or trailering at low speeds

Low Speed
Moderate Speed
High Speed

while improving stability, handling and control at higher speeds. The system also enhances vehicle stability at highway speeds as it helps the driver compensate for wind turbulence encountered when the vehicle is passed by a large truck.

The system operates in three ways. At lower speeds, the rear wheels turn in the opposite direction of the front wheels. At moderate speeds, the rear wheels remain straight. At higher speeds, the rear wheels turn in the same direction as the front wheels.

What Other Affects Does QuadraSteer Have on a Truck?

The QuadraSteer adds approximately 100-150 lbs. extra weight to the truck and requires a beefier 9.5" rear axle, as opposed to the 8.5" rear axle normally found on GM's conventionally steered trucks.

In durability testing GM claims to have found no unusual wear or tear on the QuadraSteer's rear joints even after towing heavy loads for extended periods.

Which Truck?

Though GM won't say which truck will receive the QuadraSteer, we are laying odds on the GMC Sierra.

QuadraSteer originally made its appearance, earlier this year, on the GMC Terraydyne concept truck at the North American Intenrational Auto Show.

What Else?

GM has signed an exclusive contract with Delphi to use its QuadraSteer technology for an undisclosed period of time.