Checking gear ratios

I am seeing more folks on the boards that have questions about differential gear ratios and how to find out what they have for those ratios. There is the door stickers and such for decoding and a very general search will take you there with endless lists of those threads.

A quick eazy lazy check,,and it is redneck accurate because that is it's only choice.

"What gear ratio do I have?

Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posi’s and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns, you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading."

Skimmed from here, with lots of other info about differentials and interesting stuff.
http://www.differentials.com/technical-help/faqs