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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 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

On 12/18/2024 Michael Bondi had this to say:
I am so pleased that I can hardly put it into words. My 2003 F350 was towed there, for what I thought for sure to be a water pump, because coolant was pouring out of the front of the engine. Andrew located the issue as being a split clamp. Other places would have put in a new water pump, because that is what I was expecting. Honesty and integrity are in short supply now a days. Thank you for not taking advantage of an old man

On 11/18/2024 Mark Shaffer had this to say:
We had a transmission replaced as well as several smaller repairs on other vehicles. Our experiences have all been positive. Andrew and his team did excellent, honest work at a fair price. I would not hesitate to bring my vehicles back to them or to recommend them to someone.

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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