[68K20 x Drill]

Do you have disc brakes on that truck?
If so you can pull the caliper off and tie it out of the way, then you will have a better 'ear' for what the bearing is doing.
Wheel bearing fail in 3 ways.

#1 loose adjuster - there should be 1-10/1000" in and out play in the hub &the nut should be a little shy of finger tight.

#2 contamination/impact/no lube damage - If its making crunchy noises, its had, most likely needs both inner and outer bearings.

#3 Hub failure - This one is sneaky, sometimes the hub surface the race is supposed to press into becomes loose, the bearing is fine, but won't hold adjustment. usually the inner bearing.

#4 Not exactly wheel bearing, but sometimes the spindle will be too worn where the inner race rides on it.

Neither the idler arm or pitman arm should have any up and down play.
Just a few thoughts.