Today, while idling throug the school pick up line, I started hearing a loud popping coming from the front end area of the truck. It's not as apparent at higher speeds and there is no vibrations or any other symptoms. When I got home I looked under the truck and noticed two drops of gear oil on the outside of the axle housing on the passenger side where the cv assembly enters the axle housing. I have not had any leaks at all before.

Specs: 2002 Quad Cab AWD 4X4 4.7L 155,000 miles