being that you're still running factory drive shafts, you do not need to correct the pinion angle in the rear but, if you were to do so, you would need adjustable rear upper arms to do that. you cannot make enough of an adjustment with just lowers to do it and, even if you could, you wouldn't want to as that would require shortening them. as mentioned, up front, you will have to balance caster and pinion angle and for the most part, give more weight to caster as that is an important part of front end alignment. if you only have adjustable front lower arms, i would just sent them to about 23" eye to eye. that is standard for a 3"-4" lift.

read through this write-up and it will help guide you in the right direction:

http://project-jk.com/jeep-jk-write-...ation-write-up

 

believe me, i've installed a lot of different lift kit early on and over the last 5 years and i'm always surprised to see the differences as well. the 23" number that i put out is not based on anyones instructions but rather, what i have found through trial and error to work out best on a 3"-4" lift.

 

so, from the pictures I posted, is there anything much I should be worried about? I figure I'll set the fronts to 23" when I get a chance and see how that feels, but I take it it's otherwise good, and up to me in terms of how it feels?

 

being that you're running factory shafts, no, not really. being taller and because of it, causing your cv boots to pinch more will reduce their lifespan but, there really isn't too much you can about that. installing rear upper arms can eliminate the pinch at the pinion but, it won't do anything for you at the output shaft. i'd say you're good and like you're doing already, just keep an eye on things.