Did you not see the link above, which shows you how to clean and oil them? Again, if you want to see if the clunking is from the hubs, remove them and drive. Do you still get the clunk when you put your transfer case into 4wd? The clunking can be the hubs or the transfer case - you need to test to determine which one.
There are no plastic pieces on the hubs themselves - I assume you are talking about the round piece that surrounds the hub - this is a separate plastic 'protector' (that can actually catch water and let it lay in there next to the hub, as well - some people completely remove this). When you remove your tire, that plastic piece just slips into the center hole of the tire.
The only other thing I could suggest is to jack up the vehicle and start poking around to see if there are any loose suspension or drive train parts.
The hubs come apart by taking off the perimeter allen head screws around the selection knob then carefully pulling it and the locking gear out. You don't necessarily have to remove the entire hub unless it is really nasty. Here is a parts diagram to give you an idea how they come apart and what should go where...
When you put them back together just grease everything with a good quality wheel bearing grease just don't pack it in or anything... you want it to be able to operate freely.
Take a close up photo of your hubs and post it....if they have a plastic part they do not sound like the original hubs. I prefer warn premium to the original the seem to work smoother for me. You need to make sure the noise is from the hubs and not the drive train..
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1989 Tracker, 8V, 1.6L, automatic, 2 door tin top, one owner.
1990 Sidekick, 8V, 1.6L, 5 speed, rag top
1996 X90 auto....
1993 Geo Tracker 5 speed
Those don't really look like Aisin hubs to me. Is the plastic you refer to the outer shield in the wheel? It can be removed when the wheel is off it is probably more cosmetic than useful, once it is removed you will be able to take off the hubs next time with the wheel on. I would remove the locking hub then drive the car and see if the noise goes away. If you have any buddies who offroad they should be able to help you clean the hubs..
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1989 Tracker, 8V, 1.6L, automatic, 2 door tin top, one owner.
1990 Sidekick, 8V, 1.6L, 5 speed, rag top
1996 X90 auto....
1993 Geo Tracker 5 speed
Ok I will . Its not a constant clunk just once I take it out of 4wd are mile marker hubs good ? They have a life time warrenty.. my track has 166k miles on it too just so yall know
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