Auto Diagnostics | Portage, IN - National Transmission Inc.
carr National Transmission, Inc.
National Transmission, Inc. hallway inside shop

Fast, accurate diagnoses

Professional auto diagnostics

No more guesswork! Diagnosing engine problems can be easy with the right equipment and expertise. The skilled diagnosticians at National Transmission Inc.  get to the root of the problem quickly and efficiently, then deliver the reliable (and affordable) engine repairs you need to get back on the road fast.

Why trust us?

- Talented and experienced auto technicians

- Full range of repair and maintenance services

- Commitment to customer satisfaction

- 100% parts and labor warranty

- Servicing both foreign and domestic models

- 24-hour towing (FREE with repairs)

- State-of-the-art equipment

- Locally owned and operated

Bring your car in today


Find out EXACTLY what's wrong with your car or truck. Ask its computer! Our free computer analysis allows us to determine precisely what needs to be done in order to get your vehicle back in tip-top shape.

Get FREE computer diagnostics with any repair. Bring your car in today!

Relax. We'll have you back on the road in no time.

We don't stop at diagnostics! We specialize in transmission repairs and maintenance and can provide a wide variety of car care services, including preventive maintenance and towing.