The 2001 GMC Sierra 3500 is available as a 2-door, 3-seat regular side. Starting at $23,421, the 2001 GMC Sierra 3500 SL 4x2 Regular Cab is powered by a 6.0L , 8 -cylinder engine that returns an EPA estimated The top of the line 2001GMCSierra 3500SLT 4x4 Crew Cab , priced at $ 34,331 , is powered by a 6.0L , 8 - cylinder engine that returns an EPA estimated