Knox Performance Diesel & Offroad specializes in diesel diagnostics, repair, maintenance, and performance for Ford Powerstroke, Ram Cummins, and Chevy/GMC Duramax trucks. From check engine lights and oil leaks to fuel systems, turbochargers, emissions systems, cooling systems, suspension, transmission, and major engine repairs, we diagnose the problem before recommending the repair

POWERSTROKE DIESEL REPAIR: 7.3, 6.0L, 6.4L, 6.7L,
Whether it's hauling your camper across the country, getting you to work Monday morning, or carrying your family , your truck has a job to do. We specialize in Powerstroke diagnostics, repairs, maintenance, BulletProof upgrades, and performance enhancements. From fuel system failures and oil leaks to turbocharger, cooling system, electrical, and e

CUMMINS DIESEL REPAIR: 5.9, 6.7
Ram owners are a different breed. They expect their truck to work hard, tow heavy, and keep going. We help keep it that way. From routine maintenance to complex diagnostics, fuel system repairs, turbocharger issues, front-end repairs, transmission concerns, and performance upgrades, we provide honest recommendations & repairs you can count on when the truck is your

DURAMAX DIESEL REPAIR
From the legendary LBZ and LMM to the LML, L5P, and everything in between, Duramax powered Chevrolet and GMC trucks have earned a reputation for power, comfort, and reliability. When something doesn't feel right, our team provides the diagnostics, maintenance, and repairs needed to keep your truck ready for work, towing, and everything in between.

Knox Performance Diesel and Off Road
126 South Park Street, Killeen, Texas 76541, United States