Shares of GM rose 29 cents, or 0.8% to $37.03 in after-hours trading Friday after gaining 2.6% in the regular session.
The stock has fallen about 5% since the strike began on Sept. 16. Published reports have estimated GM's losses during the strike at as much as $2 billion.
The pact includes an $11,000 signing bonus, two 3% annual raises, two 4% lump sum payments and no change in healthcare costs, the union said. The union will target Ford Motor Co. (F) - Get Report in the next round of pattern bargaining, according to a separate statement.
Ford shares fell 1 cent, or 0.1%, to $8.71 in after-hours trading.
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