Welcome to the forumFirst of all I would like to say I'm loving the forum, I have owned a jeep of some kind since 1978 when I bought my new 79 CJ5, kept it until 1982 when I fell in love with the CJ-8 Scrambler which I bought with 6 miles on the odometer and which I still own (will most likely be buried in it) other Jeeps have come and gone, so I am not new to Jeep ownership but two weeks ago I purchased a 2015 JK rubicon unlimited Hard rock edition. Needless to say the suspension on the Rubicon is a total different critter than my CJ, so I have been trying to wade through all the different options and it is a bit over whelming, but I have settled on a lift of 2.5" since all I want to run is 35s on tire size. The Jeep will be more of a family off-roader seeing mild to moderate trails (I will save the hard core trails for the Scrambler). I am trying to take advantage of the forum's members experience (something I didn't have back when I bought my other Jeeps, since there was no internet, yes I come from a time of no computers,no internet and only three TV stations if you were lucky, any I had a few questions about the recommended setup. 1. When you say lower control arms (choose) do you mean adjustable control arms? 2. You suggest an adjustable front track bar, would it be advantageous to also purchase an adjustable rear track bar? 3. This is not related to the suspension but thought you could offer some insight. My Jeep came with the Rubicon 10th anniversary wheels which are very nice looking but are only 7.5" in width, would a 35X12.50 tire work on this wheel, I realize that I would have to use wheel spacers. Thank you for your help.
Choose meaning a brand. You could run a adjustable or a fixed length lower for caster angle.
In bold I mentioned the rear axle side track bar Bracket. Besides roll center correction the axle is centered under the jeep. So no, you do not need a adjustable rear track bar.
A 12.5 will work but you might have issues having it mounted. Tire manufactures usually have a min wheel width and shops won't mount for liability reasons.