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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Manual Transmission - ZF S6-650 - Service, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> Transmission Noisy >> Diagnostic Aids

Diagnostic Aids

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If the vehicle is equipped with the 8.1L engine, the transmission is in neutral with the engine operating, and a whirling kind of a noise, neutral gear rattle, is heard outside the vehicle, this is a normal condition.