Pulling on the e-brake is just loading the clutches in the limited slip diff. Loading the clutches allows them to "lock" and put power to both wheels as if you were driving in a straight line.
There are a couple of different types of lockers depend on how drivable you want your TJ to remain.
: These allow you to engage and disengage the locker when needed allowing power to be sent to each wheel evenly.
: Selectable lockers are the most expensive, but well worth it if you vehicle is a daily driver.
2: Auto Locker
: These will automatically lock and unlock depending on driving conditions. While going around turns they will make a clicking noise which is them unlocking and allowing the two wheels to turn differently. But when power(gas pedal) is applied, they lock up and put all power to both wheels.
: Auto Lockers are about the cheapest and more commonly used on trail rigs.
: This replaces everything and completely locks up the differential. This is 100% power 100% of the time. This is not recommended for a street driven vehicle.
: Spools are cheap, but only for the hard core rigs.
On to the lift and stuff.... what size tires do you want to run? Or what type of wheeling are you going to be doing?
I ask this because there are hundreds of ways to set up your Jeep depending on requirements and costs.