I recently decided to start researching all the various things about my '98 4Runner that concern me, and after lurking for a little while, figured this might make a good place to get some insight.
Firstly, my sticker, to give folks in the know any specific information they could want from it:

4runner sticka by Ackaroth, on Flickr
Mainly just an aesthetic issue, but my rear bumper seems to sag on the left hand side. Not a big deal, but leads me to wonder what caused/is causing it. Also, it puts a little bit of pressure on the plastic at the joint of the piece from the mudflap to the fender well.

4runner rear left bumper sag by Ackaroth, on Flickr
At times, I wonder about the front bumper as well, but dismiss it a little more easily, it could just be me. But here you can also see a bit of the looseness of the headlight.

4runner front left by Ackaroth, on Flickr
This is where it should be...

4runner headlight by Ackaroth, on Flickr
But it pushes back about 3/4 inch to this. Both sides have this issue.

4runner headlight by Ackaroth, on Flickr
Also, what is this wire casing or hose looking thing and spring? The spring isn't connected to anything on either side, and the hose, which I dont know the reason for anyway, just looks like it would be an overflow for I can't imagine what.

4runner headlight spring and hose of some sort? by Ackaroth, on Flickr
If you look closely you can see where someone drilled holes in the driver-side headlight. I am only guessing, but I had an F150 that started to collect rain in the headlight, and did something similar to this to fix it. But my F150 headlight was plastic, whereas this one seems to be glass.

4runner drilled headlamp by Ackaroth, on Flickr
And lastly, here is what happened to me January 1st of this year, my driver side ball joint decided to take a dump.

F*$# you, ball joint! by Ackaroth, on Flickr
So after what felt like a picture-show, I just wanted to list a couple of mechanical observations.
Wow, what a spew of words. I sincerely hope someone can make sense of any of this.
Firstly, my sticker, to give folks in the know any specific information they could want from it:

4runner sticka by Ackaroth, on Flickr
Mainly just an aesthetic issue, but my rear bumper seems to sag on the left hand side. Not a big deal, but leads me to wonder what caused/is causing it. Also, it puts a little bit of pressure on the plastic at the joint of the piece from the mudflap to the fender well.

4runner rear left bumper sag by Ackaroth, on Flickr
At times, I wonder about the front bumper as well, but dismiss it a little more easily, it could just be me. But here you can also see a bit of the looseness of the headlight.

4runner front left by Ackaroth, on Flickr
This is where it should be...

4runner headlight by Ackaroth, on Flickr
But it pushes back about 3/4 inch to this. Both sides have this issue.

4runner headlight by Ackaroth, on Flickr
Also, what is this wire casing or hose looking thing and spring? The spring isn't connected to anything on either side, and the hose, which I dont know the reason for anyway, just looks like it would be an overflow for I can't imagine what.

4runner headlight spring and hose of some sort? by Ackaroth, on Flickr
If you look closely you can see where someone drilled holes in the driver-side headlight. I am only guessing, but I had an F150 that started to collect rain in the headlight, and did something similar to this to fix it. But my F150 headlight was plastic, whereas this one seems to be glass.

4runner drilled headlamp by Ackaroth, on Flickr
And lastly, here is what happened to me January 1st of this year, my driver side ball joint decided to take a dump.

F*$# you, ball joint! by Ackaroth, on Flickr
So after what felt like a picture-show, I just wanted to list a couple of mechanical observations.
- After the ball joint breaking incident, the shop repaired the ABS sensor, or line, or something to that effect, I would have to look at the invoice, as well as replaced the ball joint, and did a front brake job. I have been riding the spare ever since, which seems to be almost the same size as the others, the only difference being it is a 265/70 vs the others being 265/75. Around the same time, I also got it inspected, got oil changed, and let the guys at the inspection place sell me an air filter

- Since then, I have noticed a bit of brake squeel still when slowing, as though the new pads where at the end of their lifespan, or possibly from the back drums for all I know. Its been years since I have done a brake job, and wouldn't know the first thing about messing with the rear drum without some good reading first.
- I have also noticed a bit of what I'm gonna call wobble when I am braking, but I don't notice it when accellerating or driving otherwise. It leads me to wonder if all my tires are properly balanced or if it could be something more sinister. I know I need to give them all a little touch up on air, and even though they are visibly old tires, showing early dry rot on the outside edges, they still look really good overall, dont have any visible belt separation, and haven't seem to lose any tread in the 2 years I have been driving it.
- Another annoyance, that I believe to be electrical in nature, is something has started to make a whirring noise, that is most noticeable when sitting in park. It sounds kind of like power drawing on something, and is noticeably interupted and then returned when I do things like turn on the headlights, or the a/c.
- I have also noticed that my 4Runner is either idling low, or maybe dirty fuel injectors or something, but it has a tendancy to shudder a bit and sometimes die if I leave it in park for 5 or so minutes, but seems less frequent with something like the a/c on to kick the rpm's up just a hair.
- The handling at low speeds is also a bit more sluggish feeling than I feel like it should be, although after I got it back from the shop from the ball joint incident, it was noticeably nicer. Sometimes it shifts a little hard while in traffic, I suppose when its on the brink of two low gears. I have considered whether the sluggishness could be tied to dirty fuel injectors/filter, which coincides with the thing about it dying. But I have also wondered whether it could be a power steering issue, although in my limited experience, the power steering pump gets pretty annoying sounding when its not happy, and that doesn't appear to be the case when I turn.
Wow, what a spew of words. I sincerely hope someone can make sense of any of this.