* Segment - best towing (20,000 lb / 9,072 kg) and payload (6,335 lb / 2,873 kg) supported by all - new frames and strong suspensions for maximum capability * Class - leading torque, class - leading fuel economy with up to 63 - percent lower
emissions and quicker acceleration with new 6.6 L Duramax diesel mated to new Allison 1000 six - speed automatic transmission * B20 biodiesel capable * All - new exhaust brake
system for greater feeling of
control and reduced brake pad wear *
Comprehensive set of confidence - and
control - related features, including trailer sway
control, integrated trailer brake
control, hill start assist, automatic grade braking and intelligent brake assist * Bold and new exterior design features louvered hood, front bumper, grille and 20 - inch wheels * Extended cab models feature 170 - degree - opening rear access doors for unobstructed access to the interior * Purposeful technology, including available mobile WiFi, USB connectivity, Bluetooth connectivity, XM Satellite Radio, OnStar 9.0 and navigation * Goes on sale this summer