The 2004 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $39,905, the 2004 Chevrolet Silverado 1500 AWD Extended Cab 6.5' Box is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 17-mpg on the highway. The top of the line 2004ChevroletSilverado 1500Z71 4x4 Crew Cab , priced at $ 34,495 , is powered by a 5.3L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 18-mpg on the highway.