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i have a leak from a small plate that is held in place by one 10mm bolt. It is on the top of the transmission if it is mounted in the truck. What is this for? There is no gasket and the plate may not be entirely flat is why it leaks. How do i handle this? I have taken it off and realized that I don't even know why it's there.

That "plate" actually has a short shaft attached to it, which extends inside the gearbox.
There are actually six of those plates on the gearbox (three per side) and the attached shafts are what the three internal "selector forks" pivot on.
Each of the shafts has an "O" ring on it, so replacing this, may stop your leak.

I removed my plate and it is just a plate. there is no shaft that I can see. The truck shifts fine. Is it broken?

you're right. It appears the shaft has separated from what I will call the cover. How do I get the piece out and if I remove it what happens inside the transmission? When I call to order a new one, what do I call it? Thanks, bryan

Yes, it is broken The pin is recessed in the case and must be removed. You can drill a hole into the plate and then mig weld back onto the pin.
I use a sharp drill bit and low speed to grab and pull out the broken pin while it is spinning. Use very light contact pressure when drilling or the pin may fall in

Can I weld something to the pin without the cover in place and just pull it out? I maybe don't understand what I have here. When I take the pin out, what happens? If I drop the pin, what happens?

Make sure the trans is in neutral, try using a magnet and a pick, the pin is a shift fork pivot. If the pin falls in, it may not be easy to retrieve without removing the trans
It's not as hard as it looks

Can I weld something to the pin without the cover in place and just pull it out?

You probably could weld a wire to the top of the broken pin, particularly if you had TIG skills.
As Jim said though, be careful because if that pin "dissapears" inside the casing or gets jammed in any way, you may get an instant lesson on gearbox removal and gearbox dissassembly/assembly.

Make sure the trans is in neutral, try using a magnet and a pick

If you can't get it out with this method , have someone "jiggle" the gearbox lever between the appropriate gears ("appropriate gears" = the two that are controlled by the selector fork attached to the broken pin) ....this may take the load off the broken pin momentarily, so you can extract it with non-destructive tools, eg magnet, pick, needle nose pliers, even a vacuum cleaner.

Well I have a question, If the leak was delt with i.e. fluids kept up,what could happen with a dislocated pin?
Mark

ANOTHER QUESTION. ..How frequent of an issue is this pin thing and would it be advisable to perhaps remove-pre drill thru plate into pin and weld. It's that ounce of prevention thing.......
Once again,Mark

ANOTHER QUESTION. ..How frequent of an issue is this pin thing...

Im sure someone who has rebuilt a lot more Pinzgauer gearboxes than me (someone like Jim or Dennis) may have seen it before, but in the 5 or so gearboxes I have worked on, I've never seen a broken pin.....and two or three of those boxes had had a pretty hard life!

Well I have a question, If the leak was delt with i.e. fluids kept up,what could happen with a dislocated pin?

It could be REALLY interesting if that pin worked in towards the gearcluster

Gents.
Pin sheer on 1st/rev fork pivots are due to harsh changing & clashing. Prevalent on this location the pin is shorter than most of the others and minimum side support due to the tight design inside the case.
If you were to drive the detached pin in it would butt up against the sliding dog ring and I suppose in extreme conditions could fall in the case.
For stubborn pins we use an "easy out" after centre drilling the pin to twist and pull the little blighter out.
Not an easy job for the mechanically challenged, and in some cases best left to a professional to do.
Dennis

Drill into the center of the pin, and use an EZ out to remove it. When it is removed, what happens? Do I need to be cautious to reinsert a new one? What do I call it when I call Willie?

This is the part where I say"every Pinz owner should have a set of manuals".
Just follow the instructions and pull the stinking pin out, and repair it. It is that simple, no chanting, conjouring, or mystic incantations

When you pull the pin the fork will drop slightly, to re-install wiggle the pin as you push it in(the pin tip is tapered for ease of installation).
So easy a monkey can do it

This is the part where I say"every Pinz owner should have a set of manuals".

... or four!
One can never have enough manuals