Do them both at the same time and get urethane bushings to replace them.
You have 2 ways:
1) remove the radius arm brackets. If you hvae bolts there, great. Unbolt and go to town. If you have rivits, you will need to drill, grind, cut those things out of there. It will take about 1 hour per rivit. Then replace with grade 8 bolts.
2). Unbolt the radius arm nuts, and pull the front axle forward with a cumalong or something similar.
Have fun. I cut the rivits out on my 94 Ranger, and did it that way. Then replaced the bushings with urethane so I did not ever have to mess with them again.