HOW TO CHOOSE YOUR GEAR RATIO FOR A 9-INCH REAREND | EXPLAINED 

First good video explaining this I've seen, now to figure this out to my application and move forward with my build

So I recently brought a set of 38 inch tires and I have a 2009 F150 six speed transmission four-wheel-drive and I have no clue and trying to get as much advice as I can. If I should get 4.88 or 5.13 I don’t do any off-road at all but I definitely want to have nice low and torque I mostly only do city driving. If I go on the highway, it’s only an hour away to go to the beach. Opinions please

What about a 1967 Chevy camaro RS automatic transmission with a crate 350 deluxe package ?