2015 Automatic mileage: 250 KM 2015 Sierra . 2015 Sierra, full option Z71 4x4 . Mileage 250k . The torque converter was changed, and a manufacturing defect was identified, so it was replaced by the agency. . Minor notes, no major accidents. . Modifications. . 40k BTU transmission cooler . Performance transmission thermostat . Performance engine thermostat . BTR Stage 2 cam package with dual springs . Catback with W and AFE filter . Agency maintenance . Fuel pump . Oil pump . Performance spark plugs and wires* . Mechanical fuel pump . Engine belt and AC belt And other maintenance I forgot, by God.