Last month, it offered a buyout program to all 113,000 unionized workers.
G.M. employees have several different options under the buyout program.
The company's buyout program has achieved those cuts faster than expected, a company spokesman said.
That figure, which comes at the end of a buyout program, is close to the average head count for the last two administrations.
Discussions continue with Delphi's five other unions on a similar buyout program.
The number will depend on how many workers accept the company's buyout program.
In years without a buyout program, about 1,200 teachers usually retire.
It is offering the buyout program to all full-time employees on its regional sections.
The prospect of further cutbacks, under less generous terms, led many workers to sign up for the current buyout program.
The deal was part of a $2 billion buyout program intended to reduce the nation's milk surplus.