Get to Know Tri-County Diesel in San Antonio

Our owner, Truman Johnson, has been working on big trucks since 1979, when he graduated from Texas State Technical Institute with a degree in truck repair. He then started his career in truck repair and maintenance the same year, and he’s never looked back. In fact, Truman enjoyed working on trucks so much that he opened Tri-County Diesel Service in April of 1995.

Down the road 21 years later, our San Antonio truck mechanics continue taking the extra step to make sure big rigs are safe and in good running shape when they leave our shop. We believe honesty and quality work keep old customers and new customers coming in the door. We also do a safety inspection to find all the little problems before they become big ones.

Tri-County Diesel Service Truck Repair & Service Shop

From the Owner,
Truman Johnson

"I enjoy working with people. Some of my customers have been with me for two decades, and I value the relationships I’ve built over the years. We talk about family and kids as much as trucks, so it really means something to me to keep their trucks on the road providing a livelihood for themselves and their families."

Meet Our San Antonio Truck Repair Team

Randy Wilson – Lead Truck Mechanic

Randy has been employed at Tri-County Diesel since 2007. He is certified in A/C repair, and loves troubleshooting and repairing electrical systems. Randy also excels in suspension work, and really, just about anything that comes his way.

Damon Petty – Truck Repair Technician

Damon has been employed with Tri-County Diesel since 2010. He likes to do brakes and wheel seals. He also does clutch and suspension repair. Damon performs service work such as PMs and all around preventive maintenance.

Timothy Rice – Truck Repair Technician

T.J. had worked at Tri-County Diesel Service since 2015. He does brake work and wheel seals, as well as suspension and clutch replacements, PMs, and all around general repair.