I will keep adding to this as we get farther into it.
It is important to know what was wrong with the transmission when you are about to rebuild it. Helps you focus on what needs the most detail.
We tore down a tranny that was burnt up, we knew it would need lots of work. We were pretty anxious to see what was in it and what hard parts we needed to order so not a lot of tear down pics of the burnt tranny, but I will come back and add some later.
When we started tearing it down you could tell the fluid was burnt really badly. The smell and color is a good indication.
Once we pulled the pan, that is the second indication.
This is after we had dumped all of the fluid out.

What our parts tranny looked like

We pulled the pump. The first thing we see is the overdrive clutches are burnt and melted together. We had to pry out the coast clutch drum which should fall out.

Looking at the coast clutch drum it looks like the missing area in the teeth were machined in there and it would be easy to believe that they were. But that is not the case.
When working with the unknown tranny you need to inspect everything. Every little detail.

Before tear down, it is nice to have codes, but more importantly if you can hook up a pressure gauge to the case and test pump pressure. It can be difficult to see wear on the pump gears and visually determine if they are bad.
Driver's side of the case, just above the pan is a test port for doing just that.

It is a good idea after pulling the pan and valve body to use air pressure to test apply each clutch pack and see which one failed. This also needs to be done during reassembly to make sure you have not cut a seal and put it together correctly.

I will come back and add to the trouble shooting later.

The tear down. Yes this will be picture intense
The color of the fluid is such a relief compared to the previous one we pulled apart.

Next, pull the pan

Pull the filter.

We are just using the guts of this tranny, this one is a Diesel case and we will stuff the guts into are Gas case. All the internals are the same minus upgrades from model years.
We still have to pull the valve bodies to get the guts out of it.
The filter hold the pump in, but there are 3 bolts, 2 that hold the center support and another that holds the overdrive clutch. That is why we are pulling these valve bodies.

Remove the top portion of the main control body.

There are two plastic check balls behind it.

Remove the accumulator body.

Remove the main control body

Remove the separator plate reinforcing plate.

Pull the solenoid screen so you don't lose it.

Pull the solenoid body. It can be pretty sticky where the connector passes through the case. Take your time and just keep working it. It will give up.

Behind that is the one steel check ball. Grab that and put it someplace safe.

Pull the separator plate.

Now, after you pull the gasket down, if it didn't come with the plate, be careful, this is where the majority of the check balls are. Remove them and keep track of them.
Your check balls can help you identify what year range your transmission came from.
1989 had two models, early and late. Early was 14 check balls.
Late 1989 had 10 rubber and 1 steel, total of 11
1990-1995 had 9 rubber balls
1996 and later has 8

This is the spring underneath the steel check ball that fell out when we pull the solenoid body.

Finally we have gotten to the 3 bolts we need to remove in order to pull the guts out of this thing.
See the 3 bolts in the center, form a triangle, take a 13mm socket to remove.

After pulling those I pull the tranny mount and tails housing off.