I've seen a couple post about putting gears into an automatic. I'm confused as to what that means, could anyone help me out?

 

Putting gears in an automatic means that you change your rear end (final drive) gear ratio... Then you must adjust the speedometer (using a tuner) for that gear ratio so that your speedo reads your speed correctly...

If you are going to supercharger eventually then go with 3.73s as I did...

Your car will have massive torquebut will be very manageable on the highway...

If you are going to leave your car N/A and don't need a top speed feature, then go with 4.10s...

4.10s will make your 1st gear practically useless and your automatic will rev up so fast that you will be in second gear before you can blink your eye...

With either gear selection, you will fry your tires on a hard launch so better buy wider tires but the 3.73 can be a little more tolerant of a hard launch...

If you have 20" wheels and tires, get the 4.10s becasue the the rolling weight ratio of that combination...

I run 18" with about the same overall diameter as with the stock set up so I take full advantage of my 3.73s...

Good Luck, Dave