The 2010 GMC Sierra 3500HD is available as a 2-door, 3-seat regular side. Starting at $37,835, the 2010 GMC Sierra 3500HD SLE 4x4 Extended 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 2010GMCSierra 3500HDWork Truck 4x4 Crew Cab , priced at $ 35,485 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated