Transmission Maintenance

What We Do

Transmission Maintenance

in San Antonio


Preventative Care That Protects Your Investment

Routine maintenance is essential to protect your vehicle’s transmission and prevent costly repairs. At Kosub Transmission Service Inc, founded by Gerald and Donna Kosub and now joined by Nathan Kosub, we provide professional maintenance services tailored to the needs of modern transmission systems. Our team has extensive experience servicing advanced units such as the Ford 10R80, Chevrolet and GMC 6L80E, 8L90E, 10L80E, and RAM 68RFE transmissions.

Our Maintenance Services Include:

  • Fluid Inspections and Changes: We use the correct fluid for each manufacturer to ensure proper lubrication, cooling, and shift performance.
  • Filter Replacement: Fresh filters keep transmission fluid clean and free of contaminants that cause internal wear and performance loss.
  • Leak Detection and Seal Check: Early detection prevents fluid loss and pressure drops that can damage vital components.
  • Pressure and Temperature Testing: We verify consistent pressure and temperature control to maintain reliable performance, especially for vehicles that tow or haul heavy loads.
  • Band and Clutch Adjustments: Fine-tuned adjustments keep shifting smooth and extend clutch pack life.


Our technicians understand the service intervals and technical requirements for Chevrolet, GMC, Dodge, RAM, Ford, Lincoln, Cadillac, and Jeep transmissions. From high-torque work trucks to daily commuter vehicles, every service is customized for the make and model you drive.


If you own a Ford F-150, Chevy Silverado, Dodge Ram Pickup, or Cadillac Escalade, regular transmission maintenance helps keep your vehicle running strong, smooth, and dependable for years to come.

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