The 1999 Chevrolet Silverado 1500 is available as a 2-door, 3-seat regular side. Starting at $15,355, the 1999 Chevrolet Silverado 1500 Base 4x2 Standard Cab Short Box is powered by a 4.3L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 23-mpg on the highway. The top of the line 1999ChevroletSilverado 1500LT 4x4 Extended Cab Long Box , priced at $ 31,339 , 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.