1984 K2500 4WD 8-lug

Front DS wheel hub. The front wheel bearing nuts come loose all the time. I have to check it every weekend, usually starts to get loose after a week and I have to pull apart the hub and re-tighten the nuts. Bearings are all okay, but tires wobble when they get loose...

Reverse order of install: nut -> keyed washer -> nut -> washer -> snap ring -> 4wd auto engaging assembly -> spring seat -> cap seal -> spring -> cap

My understanding is the deepest nut gets adjusted so that the bearing is tight enough that nothing wobbles but not so tight the wheel can't freely spin. Then the keyed spacer goes in and the second nut is tightened down hard to lock the first nut in position.

I've had on-and-off issues with the front DS in general as well. That side the brake caliper always start to suck in air after a few months, on #4 now. Brake system has been replaced with rebuilt MC & calipers, all new lines and warning switch. Also the 4WD doesn't seem to lock in on that hub every time. It will engage, but doesn't hold if it gets too much torque. Then other times it engages and locks and won't have any problems until next time I want to use it. It works about 70% of the time. I've taken it apart and checked everything, no burrs or wear that I've noticed to cause it.