I have RE 4.5" coils, shocks and double shear track bar up front.
I'm replacing the steering box with a Durango box so I thought I'd add a pitman arm while I was at it, if I need it.
Not 100% sure on the geometry thing.
Here are a few pics of my setup.

 

What's he bar that's going diagonal on the top left of the first picture called?

 

Under the steering stabilizer? The drag link.

 

No, the bar that is diagonal in the picture. It's black and it's on the top left of the first picture and top right on bottom picture. Every XJ has it but idk what it's called. If you look at it in person it runs horizontal

 

Look at the pitman arm in the first pic. It's whats in the way, in front of it..on top, whatever you want to call it. Lol

 

That would be the sway bar...

 

Lol, your killing me.

To answer ops question. From the 2nd pic it looks like you may need a 1 inch or so drop, but in the first pic its looks ok.

Need a pic from the front of the jeep looking straight back. The drag link and track bar need to be perpendicular, or line up with each other. Otherwise you will get a lot of wondering and possibly death wobble.

 

Id do the grand cherokee steering upgrade the pitman arm gives ya 1 inch drop if im correct. And tie rods bigger round and solid greatly improves steeering feel....