I'm guessing you're running "a more than stock cam":toothy10: so I'd go 3.91. Great for cruising around town and short jaunts on the Interstate but still go like hell on the strip.
Ya, I was told a 3.91 also, that is basically in my top 3. My 3 are a 4.10, 3.91, and a few people told me something in the 5s, but never heard of anybody running that.
