..............So, I'll need to:
1. Lengthen my quick disconnects at the front sway bar and my factory disconnects at the rear sway bar to set my sway bars parallel to the ground
2. Raise the rear track bar mount. Will this need 3" to compensate for the lift? Is there an after market part that fits this change?
3.May need to adjust pinon angle. How is this adjustment done?
4. May need longer brake lines.
5. May need to modify the transfer skid plate. Is this due to front and/or rear driveshaft hitting the skid due to the increased angles?
I'm open to suggestions and more comments.
Thank You for the help, I appreciate it.
OK with better info I would suggest you ditch the idea of using spacers on springs that are 10 plus years old, particularly if you are planning heavily loaded trips. Likely those springs have lost a bit of carrying capacity at this point and new springs would be a good idea no matter the lift. A second reason would be the lack of up travel that the spacers will afford you... the ride could be pretty poor to unbelievably poor if you are on trails of any difficulty or even easy trails with lots of frame twisting side to side "bumps" loaded. The airbags may help but they don't overcome the limits of the available travel. The suspension just isn't going to work as well as it could and I think there will be plenty of bottoming going on.
Now if you said this was a mall crawler that you were going to drive to work… go for the spacers, but I think you will be disappointed with what you proposed and how you plan to use vehicle.
Plenty of 3 inch spring lifts available that go from basic to over complete. You could use a Basic Spring and brackets kit, with an adjustable front track bar, and longer front lower control arms, rear adjustable upper control arms. Example is JKS J spec http://jksmfg.com/n-12825-jspec-3in-tj.html
May not be that kit you choose, but look at the parts included to address castor in the front and pinion angle vibes in the rear. The parts list is a minimum for a basic lift, and if you don't start there you are going to get there in the end for decent performance.
I don't run the kit, but I do run all the components included. Im looking at JKS for my JK lift so I just searched them. I have their track bars and brackets on one of my TJs , which gives me comfort in the quality. You can source the parts anywhere, but the list of what they include is complete to get you where I think you want to go.
As to your questions, a complete kit like this will have the answer to your list of 5 questions and a few you haven't asked.