GM is letting individual agencies decide how to reconcile the cut.
When Ford and Visteon made their cuts, some agencies decided to pass a 7 percent pay cut to their employees working for those clients.
GM has 12,000 contract workers, down from 16,000 a year ago. That previous reduction was part of a white-collar job cut announced in December 2000.
A DaimlerChrysler spokeswoman said while the Chrysler group has no plans to cut payments to contract agencies, the company will monitor the situation for what makes the best business sense.