Used the directions for thenewx.org

1. Remove right rear tail light assembly (2 bolts (10-MM), then pry gently as there are two plastic clips)
2. Run rubber/vinyl tubing (I used 5/16 ID with a thin wall, suggest 3/8" ID.) behind bumper along frame rail. Ziptie as necessary. Ensure you leave enough slack to accomodate the suspension travel.
(to keep dust out) available from any pet store.

4. Secure to tail light assembly using existing clips.
5. Remove breather from axel housing.
6. Pry cap from breather or purchase new nipple-type fitting. I used the existing fitting could not find a new fitting at the store.
7. Fit tubing over breather, secure with small hose clamp.

Picts:

Thanks for the step by step instructions, I had a problem with my tail light assembly do you know where can I buy one?

Most auto parts stores can get them cheaper than at a dealer. Or find a junk yard.