2009 Chevy 2500HD 4X4 ring and pinion gears

[charlie]

I have recently purchased a 2009 Chevy 2500 HD 4X4 crew cab - short bed. It has a Vortec 6.0L engine w/Magna charger 4 lobe supercharger, 6 speed automatic transmission, and 35" tall tires. Motor is producing approx. 590HP. The factory front/rear gear ratio is 3.73. This ration is too high with the 35" tires, "lugs" motor, and doesn't allow me to effectively use all 6 gears. I'm thinking of changing to a front/rear ratio of 4.56. Do you think this would be a proper ratio and is there anyone making these gears for this year model truck?