Re: left front wheel clicking-bearings?
If that is the stock front axle, Dana 30 disconnect, on a 87 YJ you can't unlock the drivers side wheel from the axle shaft. The disconnect is on the passenger side. I would check that axle u-joint. Even if it is the hub, while you have it all apart I would replace that U-joint ($12) anyhow so it doesn't break and take the ears off the axle yokes leaving you stranded in the woods.
As for replacing the wheel bearings in the hub, your time is worth something. When I had my YJ the bearings and seals, which by the way are pressed into the hub, cost around $80 for all the parts while the complete hub already pregreased and sealed only cost about $100. The dana 30 disconnect front axle does not have spindles like a CJ Dana 30. It is incorporated in the hub assembly as a unit. The hub rides inside the bearing carrier instead of on a spindle like CJ's and larger front axles. The outer axle slips directly inside the hub itself which is splined, rather than going through a spindle into a lock out. In fact if the bearings are still good the hub will probably not come out of the bearing carrier. Use lots of penetrating oil on the hub and bolts if it has never been out before because it will be rusted into place. Be sure to clean up the bearing seat in the knuckle and put a coat of grease in there when you reinstall the hub. Remember almost all of the bolts on the YJ front hubs and brakes are metric, some are 12pt. metric, so don't make the mistakes I have in the past and round them off trying to use SAE tools.
71 (C101)Jeepster Commando
97 (TJ) Wrangler
Middle Tennessee Trail Runners