Rear axle problem — logbook Toyota Corolla Runx 2001

Hello everyone! I got a problem! First of all, I decided to take an interest in the opinions of understanding people, to hear any useful advice before going to a / service ...
With a run of 180 thousand km ... my iron horse ... something whistled from under the wheels ... The whistle is so metallic ... At first I began to think that maybe the hub bearing (rear), raised the car, (lifted the ass)) turned the wheels, everything seems to be normal ... I started looking further ... I ran into the rear axle. Where the drive is, there is an oil seal in oil, you can see that it is pressing, well, in general, I realized that it’s not about the hub and nothing else, like in the BRIDGE ... "Fully driven cars. This is a complete ataz"
In general, I went to the first Kulibin I came across in the Service, I still wanted to make sure what it was all the same there ... After examining the Typewriter, they told me the following: - Quote - well, fuck your shank ... The bearing is broken, and the seals need to be changed ... This is not repair, buy a new shank, its price will cost about 20 Russian guldenoffs ...
Question: do these bearings change separately? Does anyone know the cost?
And the second question: Can I just turn off the rear drive, that is, unhook the drive, cardan and ride in the front? Will the car drive in this case?
I would be glad if someone could help me...