Welcome to the bolt.
On your rear end delima it is best to make a plan and ask yourself several questions.
What engine?
What transmission standard or auto with overdrive or not?
Do you want Positraction or not?
What highway speeds are you looking for?
You probably have a 4.11 or a 3.90 gear now, find out which one you have. There is a tag on the pumpkin (middle section) on a lot of these rear ends look for that.
All of this will determine what is the best gear for your application.
Make a plan it will save you a lot of money in the long run.
Tom