A union said many Holden workers were finding out on Friday whether they would be offered voluntary redundancy.
About 500 workers at the car maker's Elizabeth plant in northern Adelaide put their hands up to take a package.
The number interested was about 100 more than the company sought.
Australian Manufacturing Workers Union official John Camillo said the interest in leaving showed workers were deeply concerned about Holden's manufacturing future in Australia.
"These people would rather take the VSP (voluntary separation package), move on and find a job elsewhere," he said.
"Some of them have found employment elsewhere, some haven't, but they're prepared to leave now rather than continue going through the next few months or years of uncertainty about the automotive industry."
Holden said offers made to workers could now be discussed with their families and it did not expect to finalise redundancies for several days.