Factory shocks will work on a 2" lift if you don't see a lot of serious suspension articulation on your trail rides.
For sake of arguement, say that stock shocks (on stock springs) offer 10" of travel (5" compression and 5" extension) when the Jeep is sitting neutral.
Now, you put in a 2" lift and that 10" of overall travel stays the same but the new springs are pushing the shock mounts away from each other and now the numbers will look like this - 3" extension and 7" compression.
Basically what it means is that you will come to the useable limit of your shocks much quicker in an off camber situation which will either leave you with a tire hanging in the air or possibly catastrophically damage the shock (and possibly other components).
It would also be advisable to look into adding longer brake lines while you've got it torn apart. Many 2" kits offer a brake line relocation tab but this amounts to bending the hard line so that the soft line will be "relocated" down. This is workable and I've done it myself but I didn't like doing it.