Welcome To Merchant Automotive—The Duramax Diesel Engine & Allison Transmission Performance Specialists You Can Count On!

Tips From The Garage

Want expert-level info on your GM Duramax or Allison transmission equipped truck? Our team has helped over 10,000 customers since 2004. No matter if you pull a 5th-wheel, running it as a daily driver or have it tweaked to 1000+HP, we’re your guys.