Track bar bushing removel
I'm not sure what you mean by "getting a dana". The axles you have under your jeep now are DANA. The front is a Dana 30 and rear Dana 35. If you were talking about upgrading axles then that's up to you. The rule of thumb that I heard was; any tire size 35" or higher, the Dana 35 rear axle will most likely break. When I upgraded tires, I found myself a Dana 44 for the rear and regeared that along with my D30.
4.56 will make a big difference, I assume that you rarely use 5th gear with the stock ratio. I have 4.56 in my 91 and I am pushing 36s. I'm right back to stock performance, all but my top speed... it tops out at about 75 - 80 mph.
As for insalling the gears, if your a good mechanic, try it out. I left it to the pros cause if you get that wrong, you have to do it over and over till it's right, and I didn't have the time to do that since mine is a daily driver.
Joop