What We Do
Transmission Diagnostic Evaluation in San Antonio
Accurate Testing Before Any Repair Begins
Accurate diagnostics save time, money, and unnecessary repairs. At
Kosub Transmission Service Inc, founded by
Gerald and Donna Kosub and now
joined
by Nathan Kosub, we specialize in identifying issues in today’s most advanced transmission systems. Our technicians are skilled in evaluating complex units such as the
Ford 10R80,
Chevrolet and GMC 6L80E, 8L90E, 10L80E, and
RAM 68RFE transmissions.
Our Diagnostic Process
- Electronic Scan Test: Using professional-grade scan tools to identify transmission-related codes and data irregularities.
- Hydraulic Pressure Testing: Checking line pressure, solenoid performance, and valve operation under load.
- Test Drive & Data Logging: Capturing real-time shift performance and drivability feedback.
- Visual & Electrical Inspection: Examining solenoids, sensors, and internal wiring harnesses for wear or corrosion.
- Evaluation & Estimate: Presenting a clear report of findings and the most efficient repair solution.
Our team has extensive experience diagnosing electronic control issues, valve body failures, and hydraulic problems in Chevrolet, GMC, Dodge, RAM, Ford, Lincoln, Cadillac, and Jeep vehicles. Whether you are dealing with slipping, delayed shifting, harsh engagement, or a check engine light, we identify the source with precision.
Do not let transmission problems go unchecked. Even advanced units like the 10R80, 8L90E, or 68RFE can develop internal issues if left unresolved. Let our experts find the problem early and restore your vehicle’s performance with accuracy and care.
