Something broke in the transmission — logbook Toyota Altezza 2000

Saturday night I went for a drive around the city, sideways and taking pictures of chickens. First I went for a friend and nothing foreshadowed trouble. Already approaching his house, there was a strange knock somewhere in the cardan area. Similar to what happens when cornering on a welded differential.

Since I have tea leaves, I didn’t pay much attention, but the sediment remained

I thought it was the road surface. Guessed wrong! He waited for a friend and we drove off, the knock did not disappear, but rather increased even more. Came out to inspect the car, no external signs of damage. Let's go further, turn on the first gear and after 3 meters the knock began to be accompanied by blows. I turn on the neutral and the blows stopped, but the sound remained. I roll down the hill, wondering what could have happened. It is obvious that the breakdown is somewhere in the transmission, gearbox, cardan or box.
You can't go further, you can only roll. I called my teammates, they helped me drag the car to the garage, although I had to remove the bumper, since there was no other way to get to the hook.
The first attempt to drag the car failed, something jammed and the wheels blocked, the assumptions were - 90% that it was a gearbox and 10% that it was a box. He rolled back, made an attempt number 2, the car drove off, and we were already thinking about calling a tow truck! So they drove her to the garage without incident.
The time was later, somewhere around 02-00, I decided to leave the car until the morning, and then figure out what's what. I took a beer, my friends delivered me straight to the house, for which I respect them a lot, and I stomped to watch a movie.

Sunday. Noon.
I'm going to the garage, on the way I crossed paths with a friend. We went to the auto shop, bought everything you need and moved to disassemble the iron horse.
They made a bet that the main pair (GP) was screwed up in the gearbox. I twisted the drain plug and there was no doubt left, oil painting:

Of course, it could be a broken tea leaves, but we were sure that it was a GP. I drained everything to the end and the fuss began with the removal of the gearbox, otherwise the GP cannot be changed.
This is a laborious task, so I painted the front bumper in between. I sanded it, degreased it, and this is how it began to look after about a couple of hours:

Leave the bumper alone.

And so, the gearbox is removed:

We open the lid and see: a bitten GP driven gear and a magnetic plug with stuck metal chips and pieces of teeth

We pour out everything that was hanging inside and take out the differential

We see the drive gear from the GPU eaten by 1/3

Close-up. The teeth are broken off at the root!

Removed driven gear

That's it!
Fortunately, in such a case, a disassembled gearbox lay in stock, you just need to change consumables, wash everything from chips, assemble and put it in place. What am I going to do tonight.

Positive points:
Welding generally turned purple all these movements and breakdowns of the GPU
Blew the bumper and cilia in body color

Unpleasant:
Lost Saturday night and all of Sunday.
-1 main couple 4.1
Unforeseen expenses, about 1000r
I had to go by bus to work :)

On Monday evening, everything was ready, spent about 6 hours on everything about everything. It turned out of course for a long time because I did it slowly and in one.
The car now drives like before or even better!