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VortecMAX Performance Package:
Designed to enhance the towing capability of 4WD models of the Silverado 1500 extended cab/regular-length box and Silverado 1500 Crew Cab, the new VortecMax Performance Pack includes a high-output Vortec 6000 engine rated at 345 horsepower (257 kw) and 380 lb.-ft. of torque (515 Nm), a heavy-duty trailering package and a new 9.5-inch rear axle. Chevy Performance Engine

The high-output 6.0L engine and heavy-duty 9.5-inch axle help give Silverado best-in-class towing capability. The VortecMAX Performance Package also includes a locking rear differential, special exterior badging and a unique engine cover.

The VortecMAX Performance Package is available on all 1500, 1500HD and 2500HD cabs, with either 2WD or 4WD. It is available on vehicles with mid- and uplevel trim.
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