The 2007 GMC Sierra 3500 is available as a 2-door, 3-seat regular side. Starting at $32,165, the 2007 GMC Sierra 3500 SLE1 4x4 HD Regular 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 2007GMCSierra 3500Work Truck 4x2 HD Regular Cab , priced at $ 23,895 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated