92 ford explorer. The left hub is clicking. Do they both need to be replaced?

How can i check them to see if i only need one?

Please reply

could be the u-joint at the wheel clicking.

Its not the u-joints. I was under the truck, and turned the front driveshaft by hand. And the hub is clicking, it will catch and than slip and than catch and than slip. You can watch the tire not move, but than catch and move.... i did this with the lh tire up in the air, the rh tire was on the ground and had weight on it. so it seams like the lh is slipping than catching.

What do you guys think?

The u joint looks fine, and its not slipping at the u joint.

Replace with Warn Manuals. Cheaper and less likely to crap out on you. Supposed to be fairly simple to. I think the instructions are on the Singleton site.