So after having crushed a lower control arm mount, the front end was a little off I guess, and was putting stress on my rubber bushings at the frame. (I have RE superflex lower CA's). I noticed the bushings were cracking and pushing out. Now after having new CA perches welded in, I need to replace the rubber bushings because their so bad I can feel the front end actually moves back and forth when I come to a stop.

My question is why does Rubicon Express use rubber bushings? Wouldn't it be better to replace with urethane?
As far as 4x4 vehicles what are the advantages and disadvantages of both?

Bushings in control arms is a terrible idea for any vehicle seeing any offroad action. Replace the bushings with a good joint, like Currie or Ballistic, or sell those arms and buy new ones.

Even if the vehicle is a daily driver?? Why would they even put bushings then, Why not just put joints to begin with?

The arms have joints at the axle end of the arm already.

Joints are much more expensive than rubber bushings, that's why. Take a look around.....Currie Johnny Joints have the same NVH characteristics as rubber and have a MUCH greater range of motion. There really is no downfall. The other joints (Ballistic and the likes) will not absorb NVH as well as the JJ but are awesome for a non-DD jeep. I have Currie arms and I would venture to say my ride is better with them. Rubber blows in control arm applications, ditch it.

Do you know if I can use the JJ from Currie on my RE control arms?

That is something I could look into doing. But Im not replacing the CA's..this lift is practically brand new.

I always thought you needed bushings on theframe end or else the CA would let the axle walk while driving.