I don't know how to change these. Im not sure if I need to drop the springs or if I could jack the front end up from the frame and then undo it. Thanks for the help in advance.

 

Jack up front end, support frame with tall jack stands. Remove jack and put under front diff. You can undo the top coil spring stay brackets. Undo shocks and tie rods/drag link. Lower axle down, unbolt front c bushing bracket on both sides. Pull entire axle forward away from the radius arms so you can access the rear c bushing. Its not hard, just cumbersome. Use polyurethane bushings so you never have to do them again. They come in different caster angles. 3 degrees is the most common replacement types. Dont forget to undo the brake hose