Hey guys the front end of the jeep is starting to squeak at low speeds, also when I turn. There is some "greasy-wet" spots on the passenger side knuckle so wasn't sure if its a wheel bearing or u-joints?
I can get the task done with the help of my stepdad just need help diagnosing. Thanks in advance.
1998 XJ Limited 4.0L 193,xxx np242 Dana30/44 5" lift 31s
Video attached

 

That's a u-joint squeak. Since it's doing it while driving straight, could be the axle joints or the front driveshaft joints. Axle joint noise usually changes on turns, normally for the worse. Driveshaft noise is fairly constant. I'd look at the double cardan joint in the front driveshaft first- that's what the noise sounds like to me.
Oil on the knuckle is often a failing front differential seal- see if it's coming from the axle tube.

 

Thanks man. I will take a look at it this weekend. Would you guys recommend the OEM spicer u-joints or moog?

 

Spicers last a very, very long time. They require no maintenance, but when they go, it's massive vibrations in your vehicle until you replace them. Any kind of greasable u-joint will last a very long time, too, and don't require too much upkeep. The thing that sucks about greasable driveline u-joints is moving the car or wheels so that you can spin the driveline and get to the zerk. I grease them at every oil change, btw.