GMC Sierra 2021 Peace, mercy, and blessings of God be upon you. I hope you read the advertisement carefully before calling. Type/ GMC Sierra AT4 Model/ 2021 Mileage/ 130 Body condition/ Agency Mechanical condition/ Guaranteed gearbox, engine, and suspension, everything is agency guaranteed. ((Specifications)) Full option 8 Cylinder - 4x4 - Heated and cooled seats - Screen - Rear camera - Leather seats.