I have a 2016 with 2000 miles on it. Getting a 4" lift with 35s and the Yukon 4.56 gears. Do I really need the Yukon mater rebuild kit?
You probably do need the Master Rebuild Kit on a truck with so little mileage. That being said, there are seals, crush washers, and crush sleeves that are tough to uninstall without destroying, and you may want to talk to your installer about local availability of those parts.