Newbie here ...
Any pointers on where I should start to look for fixing this wobble in the front end on the wheels/knuckles?
See video here
Front knuckle bearings? Wheel bearing adjustment lock nut?

I'm a new owner of this '85 4Runner 22RE; so can't comment if this issue is new or has been there in the past.
Here is what's in front (FWIW):

• RCV Chromoly Shafts and hub gears
• Hi Pinion 4:88 Yukons/ Grizzly Locker Fully Assembled 3rd Member from Marlin
• Marlin Knuckle Gusset
• Marlin High Steer w/ heims all around
• 6 shooter knuckles
• Trunnion Bearing eliminator kit
• Full PSC Ram assist system (Pump, Cooler, etc.)
• 17x9 -30 KMC Lobo rims
• 37x12.5 Nitto Trail Grapplers

Let me know what other details on the truck you might need to help me diagnose this one.

 

Hard to diagnose drivability issues without attaching my assometer to the vehicle.
How fast are you going when you first notice the wobble?
does it wobble all the time when over said speed or does it start when you hit a bump?
93.45% of shaking/wobble/vibration issues are caused by tires and or wheels. Out of balance, bent etc.

 

I don't have any noticeable wobble when driving.
If you were able to see the video linked above, you can see the vertical 'play' in the wheel itself.
That is what I'm trying to address.

 

Sorry, I didn't notice the video link.
looks like knuckle bearings from your camera angle, it seems like more lower than upper, have a second person wiggle it while you look.
it's easy to tell if it's wheel bearings or knuckle.

 

with a trunnion bearing eliminator kit i wouldn't expect that much play in the knuckle bearing area, but perhaps it was installed wrong or somehow just worn out, which would be weird because the metal is super hard, like bearing race hard... do both sides do that?

if it is the wheel bearings you'll want to take it apart and figure out what got screwed up, probably replace all of the wheel bearings and at least that big seal in the back, that goes around the spindle... if there is any pitting in the seal surface there, replace the spindle, they aren't too expensive.

if you pull the axles you'll be able to tell how bent the axle housing is, hopefully you can get 'em back in.

do not drive the truck with that wobble problem.

 

Had the problem...................put on a new stabilizer shock.

 

All fixed!
Ended up being the axle hub spindle adjustment and lock nuts that had loosened up.