GM Quadrasteer: Groundbreaking Steering, Costly Misstep
GM's Quadrasteer rear-wheel steering system, developed with Delphi for the GMT800 GMC Sierra Denali, cut turning radius and improved stability when towing, using multiple modes and limited rear-wheel angles. Yet it carried a $7,000 price tag and added about 350 lb to the truck, which led to weak sales and its removal from GM’s lineup by 2005; the concept resurfaced in the 2026 Sierra EV in limited trims, though GM cautions about broader rollout amid EV development delays.