Whats the difference in Gear Ratio Please explain! More in box below

I am trying to find someone to explain the rearend gear Ratio what is it all about ?  As far as performance , Acceleration ,Posi  lock, etc  so on and so forth please thanks.

Gear Ratio: 3.50, 3.70, 3.89, 4.11, 4.30, 4.56
Gear Ratio: 4.71, 4.86, 5.00, 5.14, 5.29, 5.43, 5.67
Gear Ratio: 3.25, 5.83, 6.00, 6.20, 6.33, 6.50  

Rear end gear ratio is for every one full revolution of the rear wheels, it takes a certain number of revolutions of the pinion gear/driveshaft.

So, if your gear ratio is 4.11, it takes 4.11 turns of the driveshaft/pinion gear to make the rear wheels make one complete revolution.  

Hmm. Look at it like this. The gears on a car are different size just like a on a 10 spd moutian bike. If you ever tried to start from 0 in 10th gear you are going to find out you aint going to go very fast. You have to start off in 1 or 2nd gear. It acts like a pulley. Thats what a transmission does.
The lower gear you have the more hosepower you will lay on the pavment, and the slower you accelerate. The higher the gear ratio the less hp you lay down and the faster you accelerate depending on HP. You have to have enough HP to overcome the harder pull it will take to turn the wheels on a higher gear ratio. Chevrolet Corvettes, Dodge vipers, and Ford GTs all run long gear ratios because they have the power to turn the higher gears faster. Thus making them americas powerhouses. They got power, speed, and acceleration all from lots of power and long legs(gear ratios).
DIESELS!! Lower gear ratio, more power and tremendous torque output.
http://science.howstuffworks.com/gear-ratio.htm I hope this kinda helps as to how it all works.    

Oh posi lock means that the tires cant or dont spin in different directions. If you pick up the rear end of a truck and spin one tire one way, the other tire will spin the other way. That is  OEM (Origonal Equipment Manafacture). This helps to not shred your tires when you take turns, one slips since the outer wheel will be making a longer travel than the inner tire when takin ga turn. POSI Tractions wont do this. they shred tires when you take every turn. The inner tire always slips and squeals like you got a cat under your tire when you take a turn even at 2MPH. LSD (limited Slip Differential) means it is a normal differential until one side slips so much then the differential locks up and it turns it into a POSI traction and they wont slip anymore. Their are two types of LSD's. Vicious LSD and Sequential SLD. Vicious uses silicone to apply pressure to kick in the other side and turn it into a POSI LOK. The Sequential uses calibrated clicker. The clicker clicks one time when the wheel spins and clicks so many times and kicks in the LSD. But they both have the same end result when turned into a posi.
The Vivious LSD turns back into a normal differential when stop spinning. The spinning sintripicle force stops so the pressure applied to silicone stop. When spinning the sintriplice force applies pressure to the silicone which in turn applies pressure to a plate and pushes it outward on the other side that isnt spinning and the plate catches the non spinning tire and they lock together and both start to spin.
The Squential will release pressure when not spinning and it resets itself after so much time. The times spin before kicking in, and until reset varies with differential and manafacture. Detroit Locker LSD's are one of the better ones I've seen and heard of. Usually on sequential you have to reverse and turn from side to side to get it out but not always. Posi's provide more traction for forward push. It all comes down to this. Which one will help you accelerate faster? One tires pushing forward, ot two tires pushing forward? Hope this helps.