The 2005 GMC Sierra 3500 is available as a 2-door, 3-seat regular side. Starting at $32,115, the 2005 GMC Sierra 3500 SLE 4x4 Regular Cab is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2005GMCSierra 3500SLT 4x2 Crew Cab Dual Rear Wheel , priced at $ 38,460 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated