Most, if not all you wanna know:

http://gearinstalls.com/index.htm

http://www.4crawler.com/4x4/4R_TechInfo.shtml

http://home.4x4wire.com/erik/diffs/


Calculating the new Ratio:

~ New Tire Size x Old Gear Ratio
New Gear Ratio = ―――――――――――――――――
~ Old Tire Size


Yellow=High Gas Mileage, poor Torque/Power
Black=Ideal/most Factory Spec
Blue=High Torque/Power/Towing , Decreased Gas Mileage