Restoring Shifting Power and Performance to Heavy-Duty Trucks

Transmission issues can quickly sideline a diesel semi-truck and bring operations to a standstill. Cornwell’s Truck Repair provides professional diesel semi-transmission repair in Tucson, AZ, helping drivers regain performance, reliability, and control. Conveniently located on South Craycroft Road, our shop delivers accurate diagnostics and high-quality repairs for heavy-duty transmissions. Minimize downtime and protect your route—call (520) 790-7990 today to schedule service in Tucson, AZ.

Diesel transmissions are complex systems that require specialized expertise. At Cornwell’s Truck Repair, our technicians have the knowledge and tools necessary to diagnose and repair transmission problems accurately. Whether your truck is experiencing slipping gears, delayed shifting, fluid leaks, or unusual noises, we provide dependable solutions designed for long-term performance.

Drivers and fleet operators across Tucson, AZ, rely on our shop for transmission repair services that meet commercial demands and manufacturer standards.

Accurate diagnostics are critical to effective transmission repair. Our shop uses modern diagnostic equipment to evaluate electronic controls, sensors, and mechanical components. By identifying the root cause of transmission issues early, we prevent unnecessary repairs and reduce the risk of future failures.

This diagnostic approach saves time, lowers repair costs, and ensures your truck receives only the services it truly needs.

Comprehensive Diesel Transmission Repair Services

Cornwell’s Truck Repair offers complete transmission repair solutions for diesel semi-trucks of all makes and models.

Clutch, Gear, and Torque Converter Repairs

Worn clutches, damaged gears, and failing torque converters can significantly impact performance. Our technicians inspect and repair these components to restore smooth shifting and power delivery.

Transmission Fluid Leaks and Overheating Solutions

Low or contaminated transmission fluid can lead to overheating and severe damage. We identify leaks, flush systems when necessary, and ensure proper fluid levels to protect transmission longevity.

Electronic Transmission Control Repairs

Modern diesel transmissions rely on electronic systems for precision shifting. We diagnose and repair control modules, wiring, and sensors to ensure proper operation.

Preventative maintenance plays a vital role in avoiding major transmission failures. Regular inspections, fluid checks, and early repairs help extend the life of your transmission and prevent unexpected breakdowns. Cornwell’s Truck Repair works with drivers and fleet managers to develop maintenance plans that align with usage and operating conditions.

Proactive care reduces downtime and protects your investment.

In-Shop Transmission Repair You Can Trust

While some issues can be stabilized through mobile service, transmission repairs are best handled in a controlled shop environment. From diagnostics to major repairs, stop by our shop and get back on the road with confidence. Our Tucson, AZ, facility is equipped to perform detailed transmission work safely and efficiently.

Supporting Tucson’s Trucking Community

Cornwell’s Truck Repair is proud to serve the trucking community throughout Tucson, AZ. Our reputation is built on honest service, skilled workmanship, and a commitment to keeping trucks running safely and reliably. We understand the demands of long hauls, tight schedules, and heavy loads—and we repair transmissions with those realities in mind.

Schedule Diesel Semi Transmission Repair Today

Don’t let transmission problems slow your operation or create unsafe driving conditions. Skip the wait—bring your truck to our shop for expert semi-truck repairs today.

📞 Call Cornwell’s Truck Repair at (520) 790-7990 to schedule diesel semi-transmission repair in Tucson, AZ.