2013 Yamaha Grizzly 450 Auto. 4x4, 2013 Yamaha® Grizzly® 450 Auto. 4x4 Mid-Class Grizzly® Capability And Toughness This rugged, mid-sized ATV features and ideal mix of power, performance, and off-road capability. Grizzly® 450 Automatic 4x4 has many of the same great features as big brothers Grizzly® 700 and 550, including four-wheel independent suspension, and it s powered by a fuel-efficient, liquid-cooled engine. Fully independent long-travel four-wheel suspension features double-wishbone suspension front and rear. The mid-class Grizzly® 450 features nearly everything the big bore bears boast, including Ultramatic automatic transmission, On Command 2WD/4WD, EPS and more.