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Home >> GMC >> 1987 >> Forward Control 7.4 W, Automatic, 400/M40 >> Repair and Diagnosis >> General Information >> Map - Exhaust Systems >> Exhaust Systems >> Muffler Valve
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Muffler Valve

Condition Code Procedure
Inoperative A Require repair or replacement
NOTE: It may be necessary to replace the muffler assembly to correct this condition.
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