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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

Portage, IN | Valparaiso, IN | Hobart, IN | Merrillville, IN | Chesterton, IN | Crown Point, IN

What We Offer

Our Services include:

Our Products include:

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

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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

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