i have a 9 in limited slip with i have no whats inside...! i have alot of power but its not getting to the wheels im not worred about freeway speeds because i have a t5(overdrive). i just dont understand rear ends is it the ring and pinion that people change let me know what i should do, and an explanation on the whole thing

 

Yes the ring and pinion gear is what you change when you're switching your gear ratio. A taller (numerically lower) gear set like 2.80's or 3.00's are a lot of times what people will refer to as freeway gears. The gear set # references to how many rotations the gear set makes before the tires make 1 full rotation. That means with 2.80 gears, the gears rotate 2.8 times before the tires make one full rotation. So now when we look at a lower (numerically higher) gear set like 3.55's, 3.73's, or 4.10's, you can see that that the gears are making a lot more rotations before the tires make a full rotation, which is directly related to higher torque figures. 3.55's are able to torque up a lot more than freeway gears which is why people put in lower gear sets to get better off the line speed and such.

Thats just gear ratios in a nut shell. Now changing gears isn't neccessarily going to help you get your power to the ground. You may want to experiment with a slightly larger tire size or suspension components if you haven't already done so.

 

Heres a simplified version. WHen you have a gear ratio, lets say a 3.55, what this directly relates to is driveshaft rotation vs. axle rotation. So basically, with a 3.55 gear, your driveshaft will make 3.55 revolutions in order to make the axle turn 1 full revolution.
When trying to figure out what gear to go with a lot of people on here will tell you some crazy **** like go with 4.10's. Sure 4.10s are great gears for the drag strip but really suck on the highway, even if you have a OD gear (unless its .50:1 ratio). Also, the higher numerically the gear the more torque gets to the tires, which will also make the car very squirly in bad weather conditions. Not saying that youre going to drive your car in that, but you never know. Aside from that they dont make 4.10's for the 9", its 4.11.
Also, I would need to know your tire size before recommending a gear. Tire diameter plays a pretty key role it determining what gear would be ideally suited for your car.
-P.

 

I don't want to hijack this thread, but since you're asking. I' have a 3.70:1 ratio. My tire size will be 26.1" Is that the ideal ratio for a 9"? I have a T5.