Has anyone changed the gears in their 2019+ Power Wagon with the 8-speed tranny? What are the RPMs running at 65-70 with 37-inch tires with 4.88 or 5.13 gears? Has anyone done that setup that can add or any gear heads that could help me out? Which one would work better? I keep getting about 4 different answers when I try different math methods to get the right gear ratio to get back to stock performance.