General Motors Actually Issued a TSB That Encouraged Owners to Install This Alternator on Corvette's All the Way Back to the 1997 Model Year. This was GM's Solution to a Really Annoying Rumbling Noise at Idle, Which Nobody Could Fix. The TG15C051 and the later TG15C046, TG15C089, TG15C107, TG15C139, TG15S051 are the Same Unit, BUT Using Different IDP (Decoupler) Pulleys. The Units Cannot be Used in Place of Each Other in the Applications.
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