DESCRIPTION 2001 GMC Sierra SL K3500 Dually (RR0573, Unit A19), SL model, gas engine, automatic transmission, regular cab, AC/heat, AM/FM radio, winkle steel flat bed with 5th wheel gooseneck ball, chrome running boards, receiver hitch, tow/haul mode, LT215/85R15 tires, shows 194,677 miles. Serial Number: 1GDJK34G81F106519 Notes: Weak transmission.