The Chevrolet Avalanche is a four-door, five or six-passenger pickup truck sharing GM's long-wheelbase chassis used on the Chevrolet Suburban and Cadillac Escalade EXT. Breaking with a long-standing tradition, the Avalanche was unavailable as a GMC, but only as a Chevrolet. Production of the Avalanche started in July 2001[citation needed] and ended April 2013,[citation needed] producing two generations in its lifespan.