Honestly I take it to reputable gear shop, I've done everything on my jeep myself but gears are one thing I'd leave to the pros. Gears have to be set up dam near perfect and you need special tools, not saying you can't do it yourself its just not something I'd attempt.
90 - xj laredo- 4.5" rough country lift, 6.5" of total lift with drop brackets, zj disc brakes on c8.25, olympic winch bumper, jcr upper and lower quarter armor, IRO hack-n-tap and rock sliders and rear bumper. rugged ridge 8500lb winch. Spartan locker up front. With a jd yellow paint job, 97+ front end and bushwacker cut out flares. 35's