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Oil Pan,
Stock the Suburban came with 4.10 gears, so I will be running them for a bit, but the eventual plan is to run 3.42 gears. That is the highest ratio I am aware of for the stock 10.5 14bolt/9.25 IFS differentials. With 6.34:1 first gear on the NV4500, taking off shouldn’t be a problem even with the higher 3.42 gear ratio.
Stock 4.10 with 0.73:1 overdrive and 31.8” tires equates to 1800RPM at 55 mph and 2300 at 70 mph. Stock 3.42 with 0.73:1 overdrive and 31.8” tires equates to 1500RPM at 55 mph and 1900 at 70 mph.
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