This is a genuine Dana/Spicer ring and pinion for the M220 rear axle found in some 2015-2019 Colorado and Canyon trucks. Please note that not all of these trucks had the M220, some had the M210. The pinion number is 10004301 and the ring gear number is 10004300.
2015-2019 Colorado & Canyon Rear, with 3.6L V6, 2.8L Diesel, or 4 cylinder with M/T