Delphi's new four wheel steering system, 'Quadrasteer', which debuted on GMC Sierra Denali full size trucks this year, will now be available in the 2002 calendar year on GMC Sierra and Chevy Silverado 1/2 ton, extended cab short box trucks. In addition, 2003 models with optional Quadrasteer include Chevrolet Silverado and GMC Sierra 1500HD short box crew cabs and Chevrolet Suburban and GMC Yukon XL 3/4 ton full-size sport utility vehicles.