The 2003 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $22,500, the 2003 Chevrolet Silverado 1500 LS 4x2 Regular Cab Short Box is powered by a 4.3L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway. The top of the line 2003 Chevrolet Silverado 1500 Base 4x4 Regular Cab Long Box, priced at $22,350, is powered by a 4.3L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway.