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Billet aluminum upper fan idler pulley in our custom spoke design and black anodized finish. Complete with bearing. Our pulley must be used with a factory bolt and spacer. Some aftermarket pulleys will switch to a different length bolt and spacer which will not work with the our billet pulley. For reference, the factory spacer measures 1.8" total height and the factory mounting bolt measures 2.75" in length.
Looking for proven diesel performance parts that actually fit and perform? We stock hand-selected upgrades for Duramax, Cummins, and Powerstroke platforms — no guesswork, no junk.
From tuning and exhaust to suspension, engine internals, and recovery gear, everything we carry is backed by real-world testing and used by builders who know what works. If it’s on our site, it’s here for a reason.
