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Welcome to Allegiance Automotive

Taking Care of you and your vehicle with courtesy and commitment. At Allegiance Automotive, we love cars & trucks, and spend every day repairing and maintaining vehicles in our Boulder, Colorado location. We believe in full service car care and superior customer service.

Factory Maintenance

The key to vehicle health and car owner happiness, our experts provide the full spectrum of factory maintenance.

Diesel Expertise

Let our genuine diesel experts repair your Powerstoke, Cummins, Duramax or any other engine without spark plugs.

Ford Specialists

Ford specialists who gladly repair all makes and models


Blowers, Cams, nitromethane, 4 link suspension, tubbed rear ends and all other things streetrod.


Providing Quality Service and Repair for Your Vehicle



Office Admin



Service Writer




Common Services

We service all your automotive repair and maintenance needs. From your family or sports car, trucks, and classics, Allegiance Automotive has the ability to service most vehicles, including gas and diesel engines.

Solid shop. I had been working with another local shop and wasn’t pleased with the service and these guys blew me away. They’re genuine, kind, straight-forward, and they display excellence in their work ethic. I’m a fan!

-Sarah G

Sarah G

These guys are great! I recommend going to Allegiance Automotive over ANY other shop! They took every opportunity to ensure I was satisfied, kept informed, and inquired where they could do better. Don't waste your time anywhere else! I was returning to Boulder on a 1300 mile road trip over the holidays, and my truck broke down just as I was passing Denver. The whole situation seemed bleak. It was New Years eve, I had significant plans the next day,…

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-Nathan L

Nathan L

These guys are great! I was returning to Boulder on a 1300 mile road trip over the holidays, and my truck broke down just as I was passing Denver. The whole situation seemed bleak. It was New Years eve, I had significant plans the next day, and I was stuck with very little options. I contacted Allegiance Automotive and spoke with the manager Jim. He recommended a great towing company that really worked with me to get my truck to…

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-Nate L

Nate L

​My husband and I purchased a salvaged vehicle last year, we knew there might be some issues so we also purchased a warranty. However, when the car started giving us problems we really didn't know who to turn to. Luckily we were paired with Bob and his team at Allegiance Automotive through a referral and we are so thankful! We brought our car in for them to look at, they did a very comprehensive review of the car and found…

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-Mara S.

Mara S

I have been a loyal customer of Allegiance Automotive for years. I always receive excellent customer service and car repairs. The staff on more than one occasion has been able to accommodate me with emergency repairs. I would rate this auto repair shop 5 stars.

-Robin M.

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Simply put…these guys are the best. They have given me excellent service for the past 8 years. They are consistent and most importantly honest. Bob and his team are top notch. Boulder is lucky to have them.


Derek C

I thought working with Bob & Caitlyn at Allegiance Automotive was great. They did a great job answering every single one of my questions in fine detail. I thought the prices were fair and they were always very responsive. They fixed my car as concisely as possible and they guarantee their work for a year.

Awesome, trustworthy place to take your car. I would recommend them to all of my Boulder friends.

-Adnan Y.

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Service was prompt and professional. I’ve taken my vehicle there twice now and I am very happy with the quality of work done.

-Vit S

Vit S

These guys are great to work with. They were able to diagnosis and fix a very tricky issue I was having with my brakes and ended up not charging me for the extra expenses it took to figure out what was going on. I'll trust these guys with all my future repairs. They are a small independent shop so they can get backed up with work but they really know what they're doing and they value your business. I can't…

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-Ron S.

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Bob Ralph and his team at Allegiance Automotive in Boulder have given me the best service I've ever had in my 50 years of owning cars. Bob is a knowledgeable and hands-on owner. His wife Charlene often is there to talk and work with customers. His team does great work at a very reasonable price. I've have always gotten good recommendations on the work I needed done and the estimates were right on the money. Most of all, I have…

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-Dave J

Dave J

I own a construction company; as a result, I have a small fleet of neglected trucks. Since switching to Allegiance Automotive my maintenance costs have gone down and my down-time due to service has gone down. They are efficient, trustworthy, and good. I recommend them to anyone.

-Brady V.

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Bob, Charlene and the rest of the staff at Allegiance Automotive are fantastic. They are very helpful and will go out of their ways to make sure you are happy with their service. They are reasonably priced and best of all they are auto mechanics you can trust to do the job and not bill you for extra unnecessary work.

-Jim M

Jim M

From the Blog


Headlight Maintenance

Headlights are considered to be one of the most important safety features in your car yet they are not considered to be one of its strongest selling points. Front lights are especially designed to ensure that the driver can see and be seen by others as well.  Keep in mind, though, that they only work […]

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Worn brakes

Signs Your Brakes Need to be Inspected

When it comes to vehicle safety, the brake system is at the top of the list. That being said, it is important to have your brakes checked by a professional at least once a year. Making sure your brakes are in working order makes driving safer for you, your passengers and other drivers on the […]

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prepare for fall

Preparing Your Vehicle for Fall

Now that the summer is over, it’s time to start thinking about getting your car ready for fall. And as the season change, so do your car’s needs. Now is the perfect time to focus on preventive maintenance for your vehicle. Give your car some attention in order to make sure that your car is […]

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Call 303-938-9454 or fill the form below