Our rear axle is a Dana M220, sometimes referred to as a Dana 46 (which is different than the actual Dana 46 on Dana's website) since it's supposedly a little bigger/stronger than a Dana 44. The new Jeep Wrangler JL uses the Dana M220 rear on some trims as well, however I've seen no confirmation that there is any parts interchangeability between the Jeep and GM implementations. They could have mfr-specific changes that mean we can't take advantage of the aftermarket parts that become available for the Jeep axles.
G80 is the RPO for the locker, it's not the axle model.
Hope this helps!
2017 GMC Canyon Denali CCLB 4x4, 2.8L Duramax, Red Quartz Tintcoat, BMS Catch Can, GMC floor liners, Weathertech no-drill mud flaps, ARE Z-Series shell