The 2004 GMC Sierra 3500 is available as a 2-door, 3-seat regular side. Starting at $33,000, the 2004 GMC Sierra 3500 Base 4x2 Crew Cab Dual Rear Wheel is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2004GMCSierra 3500SLT 4x2 Extended Cab Dual Rear Wheel , priced at $ 35,920 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated