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When you're demanding more from your diesel truck—whether it's towing, racing, or just daily hauling—your transmission is either your strongest asset or your weakest link. That’s where SunCoast Diesel Transmissions come in. Known for engineering bulletproof solutions for Cummins, Duramax, and Power Stroke platforms, SunCoast has earned its place at the top of the diesel performance world.
With a focus on in-house manufacturing, rigorous testing, and real-world performance, SunCoast products don’t just promise reliability—they prove it. From full transmission packages to rebuild kits tailored for serious horsepower, they offer everything a diesel enthusiast needs to level up.
SunCoast Diesel was built on a passion for fixing what the OEMs left weak. They design, test, and build all their products under one roof in Florida, ensuring complete control over quality and performance. That dedication shows in their billet internals, enhanced clutch designs, and innovative torque converter technology. If you're looking for a transmission that’s built to handle abuse, SunCoast is your go-to brand.
Looking to upgrade your transmission? Here are four of the hottest-selling SunCoast Diesel products, trusted by diesel enthusiasts and performance shops across the country:
Engineered for 2007.5–2018 Dodge Ram trucks with the 6.7L Cummins, this Guardian Series transmission is ideal for daily drivers who want peace of mind and serious towing confidence. Featuring billet internals, proprietary clutch upgrades, and a custom SunCoast torque converter, it’s a reliable drop-in solution with performance built in.
This all-in-one package offers a complete solution for high-performance Cummins trucks. Designed to solve the common failures of stock 68RFE transmissions, it includes billet shafts, upgraded clutch packs, a triple disc converter, and custom valve body tuning. Perfect for daily drivers, heavy haulers, and street builds alike.
Already have a high-performance torque converter? This kit gives you all the internal upgrades you need to rebuild your 68RFE transmission the right way. It includes enhanced clutch materials, billet components, and critical updates to address weak points in stock units. Ideal for budget-conscious builders or shops.
This full rebuild kit includes SunCoast’s proven torque converter alongside premium clutch packs, billet upgrades, and improved hydraulic components. Designed to handle aggressive tuning and heavy loads, this kit is a favorite for Cummins owners who want to bulletproof their transmission from the inside out.
Thoroughbred Diesel is your trusted source for all things SunCoast. We don’t just sell these products—we run them, install them, and back them with expert knowledge. Whether you're building a weekend warrior or a workhorse, our team is ready to help you find the right SunCoast solution for your truck.
Browse our full line of SunCoast products here and take your diesel drivetrain to the next level.
When it comes to diesel performance, don’t settle for stock. SunCoast Diesel Transmissions are engineered for those who expect more—more power, more reliability, and more confidence on every drive. Whether you need a full transmission package or a rebuild kit, Thoroughbred Diesel has what you need to make your truck stronger, faster, and more capable than ever.