Differential rebuild, Need help quick car at shop. Options

[Malhar95]

So as someof you know that my car was having problems getting the driver side axle to turn,
The tranny shop 1st said that some bearing on the transmision is bad so the cv axle isn't sitting there rite to recieve power


Later he said that my differential needs replacement, he should the differential today and one side is completely smooth while the other is worn out. I asked him if we can just replace that one side like a mini rebuild e said no


I'm just making sure that what he said makes sense .

Is it worth paying 600 for the job?
(Since he started the job I owe him 300 if he doesn't do anything and out the car back, 400 if he replaced really bearing he was talking about. 600 for new differential and all)

Also what bearing is he talking. About anyone know?

[Malhar95]

I'm trying to keep the car auto and don't have time with school and job to do the swap myself, that the problem I really did think about that

The shop isn't agreeing in bringing a junk yard tranny saying they won't warranty anything ten,