Automatic Transmission Repair, Rebuilds & Maintenance
Reliable Performance for Every Drive
The automatic transmission is one of the most complex systems in your vehicle, relying on a precise balance of hydraulics, gears, and electronics. At Harmon Performance Transmission & Diesel Repair, our ASE-Certified Technicians specialize in diagnosing and repairing these intricate systems to ensure your vehicle shifts smoothly and reliably. From daily commuters to heavy-duty hauling trucks, we provide the expert care needed to extend the life of your drivetrain.
Our Automatic Transmission Services
Precision Transmission Rebuilds
When a transmission suffers internal failure, a complete rebuild is often the most cost-effective way to restore like-new performance. We disassemble the unit, inspect every component, and replace worn clutches, seals, and bands with high-quality parts.
Advanced Diagnostics & Solenoid Repair
Modern automatics are computer-controlled. We use professional-grade scanners to diagnose electronic issues, faulty shift solenoids, or sensor failures that can cause erratic shifting or “limp mode”.
Transmission Fluid & Filter Service
Clean fluid is the lifeblood of an automatic transmission. We provide comprehensive fluid exchanges using premium lubricants and replace internal filters to prevent overheating and premature wear.
Torque Converter Services
Shuddering or slipping? We inspect and replace torque converters to ensure proper power transfer from your engine to your wheels, restoring efficiency and drivability.
Transmission Cooling Systems
Heat is the #1 enemy of an automatic transmission. We install and maintain auxiliary cooling systems to protect your transmission, especially for vehicles used in towing or high-performance applications.
Resealing & Leak Repair
A small leak can lead to a big failure. We identify the source of transmission fluid leaks—whether it’s a pan gasket, front seal, or extension housing—and reseal the unit to prevent low fluid levels.
The Harmon Performance Advantage
We are TransGo Tech Certified and members of the ATSG, meaning we stay updated on the latest technical bulletins and fix-kits for even the most “problematic” factory transmissions.
- Family-Owned Integrity: We only recommend the repairs you actually need.
- Convenient Service: Take advantage of our 24-hour drop-off and local shuttle service.
- Performance Ready: If you need an automatic built for more than just commuting, ask us about our performance-shift calibrations.
Get Back on the Road Sooner
Don’t ignore a slipping gear or a dashboard warning light. Early intervention can save you thousands in repair costs.