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 over 25 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.