Thanks @Deezelweazel for all your help.
When I did the car overhaul, I did dissasemble all the front of the car. Took out all the rads for cleaning (that's why an ac charge was needed). And changed all the fluids. Had to change one hose from the hydro-fan.
I did remove that 2nd coolant bottle and cleaned. Not that it was dirty.
For the tranny, I did an oil and filter swap. Didn't find anything wrong in the old oil other than that it was almost black. I used the original Merc oil. I didn't replace the wiring adapter, it gave problems later and I replaced it with the Merc part. Now it only throws a gear lever error from time to time when I start the car, but I guess that it is caused by a faulty battery that I bought. I called the parts shop and they will replace it for me in warranty.
Even so, coming for other Jeeps with other transmissions (Wrangler, WJ with gas trans) I find this one soo slow to react. It seems a grannys car.
I did bought the trans dipstick. The problem I have is that I follow the procedure you describe and adjust it. Then I go checking it another day and it's at the min level. I add it, and the another day it's at the top end of the plastic gauge. I never had this problem with the AW4s.
Now it at the top of the plastic gauge.
When I stopped by at the highway, with the temp gauge showing 120ºC, the coolant bottle was high, but not the end of the world. I noticed that a tiny line of bubbles was travelling at the front and that the coolant was pristine clean. That tool my attention.
I know that you must to be mad to open the cap in that moment, but I thought "let's see". I started to pull it out and when it was free, coolant started to raise fast, so I immediately closed it. I suspect that if it was a head gasket, it would had pressure built and the cap should at least had psssh-ed on me. But not.
I have an old ELM adapter. I tried torque and the physical gauge seemed to show 5ºC more than the measurement. But thought that usually they are two different sensors. Also have WJdiag and there are no errors.
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