Transparent Upfront Price, One Person, Return & Exchange - Buy with Confidence. Walser Experienced Autos is Excited to offer this 2015 GMC Sierra 2500HD. 4WD Vortec 6.0L V8 SFI Flex Fuel VVT 6-Speed Automatic HD Electronic with Overdrive, 4WD, Dark Ash/Jet Black w/Cloth... via CarSoup