I am installing a Dual Transfer Case setup soon and wanted to know how you all have geared your axles and what tire sizes you have. I currently have 4.10 gears with the SM465 setup and 38" tires. I would assume since I am changing to Auto, the cruise RPM will come up slightly because of the converter. I may swap out to 4.88 gears, but is it necessary in an Auto - Doubler setup with 38" tires? Give me some input.