1. place a floor jack under the pinion of your front axle - raise it up so that it's just holding it up.
2. starting on the driver side, remove control arm nut at the axle using a 21mm socket and wrench.
3. if the bolt does not slide out by hand with ease, slowly raise your jack just a bit until the bind is released. if you go too far, you will need to lower it back down. when you have it just right, the bolt will come out easily.
4. remove the control arm nut and bolt at the frame end using a 21mm socket and wrench.
5. leaving your jack exactly where it is, repeat steps 1-4 on the passenger side. again, raise and or lower your jack as needed to pull the bolt out from your axle mount.
6. set both your new adjustable control arms to 23" eye to eye.
7. loosely install your new driver side control arm onto the frame mount using the factory hardware
8. lower your jack as needed until you can align the mounting hole with that of your new lower control arm. secure it in place with the factory hardware.
9. repeat steps 7-8
10. tighten all your nuts and bolts to 125-130 ft. lbs. of torque.