overdrive

  1. adulbrich

    Overdrive crank pulleys?

    My alternators already have slight "underdrive" pulleys compared to stock. I now have "320" amp and "370" amp hairpin Singer alternators on my truck. I idle around 500 rpm and my truck shifts around 2k. Does anyone know where I can get an "overdrive" crank pulley for a 2007 Silverado Classic...
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