Transmission rebuild question

[thebeebe5]

Got the '37s trans apart.   Before sending the case to get hot tanked do these shifter check balls come out?   Is it okay to leave them in for the caustic vat cleaning process?

Disassembly wasn't too bad.  Looks like some wear on reverse gear both front and back of the teeth.  I know synchros were shot before I took it out so I'll be replacing those. Not sure there's much else to do but clean and reassemble. 

[dpollo]

I have never actually taken them out.