The 2007 GMC Sierra 3500 Classic is available as a 2-door, 3-seat regular side. Starting at $28,160, the 2007 GMC Sierra 3500 Classic SL 4x4 Regular Cab Long Box Dual Rear Wheel is powered by a 6.0L, 8-cylinder engine mated to a manual transmission that returns an EPA estimated The top of the line 2007 GMC Sierra 3500 Classic Work Truck 4x2 Regular Cab Short Box, priced at $23,585, is powered by a 6.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated