Underdrive pulleys | Chevy Silverado and GMC Sierra Forum

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ferraiolo1

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22,226 Posts

#2 · Nov 30, 2016

They aren't really worth the money or hassle for the minimal gains. But they do look nice

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ferraiolo1

· 🥇Member Extraordinaire, How-To Author, 🏅TOTM

Joined Jan 12, 2013

·

22,226 Posts

#4 · Nov 30, 2016

Search around performancetrucks.net. Some say yes some say no.

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