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Black Friday Weekend Sale - Save 20% on 500+ Merchant Automotive parts, tools, and kits with code DURAMAX20, plus $300 off Allisons with a free rear housing support, $100 off transfer cases,

and FREE SHIPPING on orders over $150 (excludes transmissions and transfer cases).

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Merchant Automotive: The largest Duramax parts supplier, manufacturer, and service center in the world

Welcome to Merchant Automotive. Founded in 2004, we pride ourselves on being the largest Duramax parts supplies in the world. Our team of trained Duramax and Allison transmission experts can help you to find whatever you need for your Duramax diesel truck.