This tight view of an alternator equipped with a Goodyear Gatorback overrunning alternator decoupler (OAD) shows how the patented spring-loaded mechanism absorbs belt drive vibration. This innovative design -- required on millions of vehicles -- boosts engine efficiency and helps eliminate noise, vibration and harshness issues. It is never appropriate to use another alternator pulley design in place of an OAD on vehicles originally equipped with this technology.
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