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Name: National Transmission, Inc.
Telephone: (219) 762-2228

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National Transmission, Inc.

About Us

National Transmission, Inc., located in Portage, IN, and serving the surrounding areas, is your premier destination for transmission services and more. Our expert team specializes in transmission repairs and also offers a wide range of automotive services, including auto repair, brake repair, radiator repair, engine repair, coolant system repair, towing service, small engine repair, vehicle diagnostics, car maintenance, and 4x4 service. Trust National Transmission, Inc. for top-notch service and reliable solutions for all your vehicle needs.

Areas Served

What We Offer

Our Services include:

Transmission Service
Auto Repair
Brakes
Brake Repair
Radiator Repair
Engine Repair
Coolant System Repair
Towing Services
Small Engine Repair
Vehicle Diagnostics
Car Maintenance
4x4 Service
Shocks & Struts
Tune Ups
Oil Changes
AC Repair

Our Products include:

Batteries
Transmissions

Testimonials

On 6/1/2025 Beth and Garvey Dickson had this to say:
National Transmission was recommended to us by Performance Auto in Hobart. After explaining our current medical situation to Pudge, he made sure to schedule our appointment on a day and time that was convenient for us. His kindness did not go unnoticed. Also, my husband was impressed by the cleanliness of the business. We will definitely recommend National Transmission. Testimonial written by Beth and Garvey Dickson on this site.

On 4/25/2025 K S had this to say:
Great service, fair prices and quality work. I recommend National Transmission to all of my friends and family

On 2/15/2025 Viper had this to say:
Great place Adam went above and beyond to get my truck fixed thank you

On 2/8/2025 Mike Kirk had this to say:
National Transmission is a wonderful place to have work done on your vehicle. They just replaced my Transmission and I'm glad I went with them vs another company they treat their customers very well. Andrew is a great manager and went the extra mile to make sure I was happy with the work that was done on my car. I will definitely be recommending him and his team to friends and family. Thanks so much National Transmission!!!!!! -Mike

On 1/4/2025 E martin had this to say:
Andrew and the team are literally a life saver! Got my heat working just in time for the freeze 🥶 easy to work with and very reasonably priced ! Highly recommend

Contact Us

National Transmission, Inc.
5475 US Hwy 6 Portage, IN 46368
Phone: (219) 762-2228
Fax: (219) 763-2029
Email: tranzman23@frontier.com

Where To Find Us

Our Hours

Holiday Hours May Vary. Please Call For Details.

Monday: 8:00 AM - 5:00 PM
Tuesday: 8:00 AM - 5:00 PM
Wednesday: 8:00 AM - 5:00 PM
Thursday: 8:00 AM - 5:00 PM
Friday: 8:00 AM - 5:00 PM
Saturday: 8:00 AM - 12:00 PM

FAQ

What are the signs that my transmission needs repair?

Common signs include slipping gears, delayed shifting, fluid leaks, burning smells, and unusual noises while driving. If you notice any of these symptoms, bring your vehicle in for a full transmission diagnostic.

Do you offer complete auto repair services in addition to transmission work?

Yes! In addition to expert transmission service, we provide a full range of auto repair services including brake repair, engine repair, AC repair, radiator repair, oil changes, and more.

Can I get a diagnostic test if my check engine light is on?

Can I get a diagnostic test if my check engine light is on?

Do you offer towing services if my vehicle breaks down?

Yes, we provide reliable towing services. Whether your vehicle has a transmission issue or another mechanical problem, we can get it to our shop for expert repair.

How often should I schedule regular maintenance like tune-ups or coolant system checks?

Regular car maintenance is key to preventing major repairs. We recommend oil changes every 3,000–5,000 miles, coolant checks annually, and full tune-ups every 30,000 miles, depending on your vehicle and driving habits.