So let me get this straight, you're wanting to replace all the syncros/ rebuilt the transmission because you read an old thread about GL-5 being corrosive?
These days GL-5 is more then likely going to be MT-1 certified. This means it's okay for yellow metals. Bronze, copper, etc... There is no issue when using GL-5 with MT-1. This is why I said, check the bottle.
Even if you poured GL-5 that wasn't MT-1, into the transmission and didn't run it then you could easily just drain it and flush it once then refill. Again not a big deal. 
looking back, i put Walmart brand GL-5 in it when i first put it back in the truck, so itd been running GL-5 for a year, and when i drained the transmission, a Great deal of yellow metal was in the fluid, some very small chips here and there from the synchronizers, had i just poured it in i woulda just drained it and been good to go, but since i see so much synchro metal in the fluid, i bought another one, and im gonna rebuild the old one
It takes several specialty tools to tear a AX series trans down.. Not worth the investment.
Carry in its about 400 to have a small privateer shop do it which is about what the tools cost.
If your really skilled you can improvise, that cost me a extra 150 for a broken gear.. 
If you cant find a shop that specifically does Jeep units, find one that knows 85 and up
toyotas, they use a variant of the same tranny.
I doubt id need special tools, just some thinking, trial and error, ive ripped apart a 1985 civic 5 speed transmission, and it was a piece of cake, i could take it apart, jumble the parts into a pile, then pick out the parts one by one, Two things to keep in mind when doing a project like this, is DO NOT LET it Intimidate you, keeping notes of All steps until you are able to just throw it into a pile of parts and assemble it in minutes and having the FSM pages on paper helps, theres Sections inside the transmission, so dont look at it as a whole, look at each part as its own piece, and take one on at a time, im sure id figure it out
