What are you wrenching on? Tire size/ springs being used all make a difference. The rear is not a bolt on, the old perches have to be cut off and new ones have to be installed. I prefer to use the conn-fer, rubicon express, or MORE spring perches, they are the well built, and MORE and RE ones are anti wrap long ones. Get the jeep level with the axle centered and under the rig, then lower the full wieght of the rear end on the suspension. You can figure out what your pinion angle needs to be from there. Tack weld the perches, take out the axle, double check the angles, and bzzzzzzz away.
The front needs to have the springs outboarded, you know that right? Major PITA in my opinion. Scrap the waggy axle and get a chevy one. Cut down the long side tube so the axle is waggy width, weld on a driver side perch, and bolt in the axle. With the chevy you don't have to outboard springs, or grind the crap out of the diff housing to get it SOA, becuase the perch is already cast into the housing.
You are looking for anywhere between 2 and 4 degrees of caster. I ran 6 degrees for a while, then went to 2 degrees, I like it better.