Hi guys, I still have my original 3.08 Ratio Ring/Pinions for the 31inch Tires in my Differentials, but driving 38.5SuperSwampers. I figured out that with 38.5 tires I would need a 3.77 ratio, does that sound ok??? (i'm driving 95% highway, very little off-road) where is a good place to buy Ring and Pinion Kits??? thanks for your help!!!