Black GMC pickup truck parked in front of a modern building.

About Us

Deep-Rooted Transmission & Diesel Expertise in Colorado

Built on Decades of Proven Experience

For more than 27 years, Colorado Transmission & Diesel Specialists (CTDS) has served the North Denver Metro with trusted expertise in transmission repair, diesel service, and advanced vehicle diagnostics. Led by Doug Friedlan, our ASE-certified team brings the technical skill, hands-on experience, and disciplined repair approach customers expect from a specialized shop, along with the honesty and personal service of a family-owned business.

From our location in Fort Lupton, we proudly serve Brighton, Greeley, Firestone, Erie, and the greater North Denver Metro area with dependable solutions for drivers, diesel owners, and fleet operators.

Our Specialized Services

Managing a commercial fleet or relying on your personal truck every day? Our certified technicians provide carefully targeted repair and performance solutions for Colorado roads and demanding workloads:

  • Transmission Repair & Installation: We service automatic and manual systems with a focus on durability, drivability, and long-term reliability.

  • Diesel Performance & Repair: We handle turbo diagnostics, fuel system concerns, drivability issues, and diesel performance upgrades.

  • Fleet Maintenance: Our fleet and automotive repair services help reduce downtime, improve operating dependability, and support longer vehicle service life.

  • Advanced Diagnostics: Using professional diagnostic equipment, we identify complex mechanical and performance issues accurately.Why Colorado Chooses CTDS

If you have been searching for the best, most reliable transmission repair in North Metro Denver, you’ve found it. We understand that when you search for "high-performance diesel upgrades in Fort Lupton" or "auto repair mechanics near Brighton," you aren't just looking for a fix—you're looking for a partner you can trust.

Why Drivers Across Colorado Trust CTDS

Drivers do not just need a repair shop. They need a team they can trust to diagnose problems correctly, explain the repair clearly, and stand behind the work. That is why CTDS has become a trusted choice for transmission repair, diesel repair, and automotive service throughout the North Denver Metro.

Our Promise to You:

  • Experienced Technicians: Our ASE-certified mechanics bring specialized experience in transmission systems, diesel performance, and complex automotive repair.

  • Specialized Expertise: We apply the right knowledge, tools, and repair standards to keep the vehicle performing at its best for the long haul.

  • Local Service You Can Trust: As a family-owned shop, we bring advanced technical capability with the personal service and accountability that customers value.