International in Denver, CO and Kalispell, MT

Get expert International truck repair from Iron Buffalo. We provide diagnostics, engine service, emissions support, and mobile repairs for ProStar, LT, and other International models.

Request Service

Colorado

Montana

International Repair & Maintenance in Denver, CO, and Kalispell, MT

International trucks are known for their durability and versatility across heavy-duty applications. Our diesel technicians are trained to handle all major International systems, including MaxxForce and Cummins engines. Whether you’re experiencing emissions faults, engine problems, or dash warning codes, we identify the issue quickly and deliver lasting repairs.

Full-Service International Truck Repairs

We offer comprehensive repair services for all International truck models—from long-haul to vocational. Our services include:

MaxxForce and Cummins engine diagnostics and repair
ProStar, LT, and HX series service
Electrical system testing and reprogramming
Brake, suspension, and steering repairs
HVAC system repairs
Aftertreatment and emissions system service
DPF and SCR cleaning, replacement, and diagnostics
Transmission and clutch service
PTO and hydraulic system repairs
Scheduled maintenance and DOT inspection preparation

We use OEM-compatible software and tooling to ensure efficient, warranty-safe repairs.

Benefits of International Trucks

International trucks are built for endurance, with robust engineering tailored to long-haul, regional, and severe-duty needs. From the LT Series to the ProStar and HX platforms, these vehicles offer a strong balance of performance, comfort, and serviceability.

With driver-focused cabins and broad aftermarket support, International trucks are a smart investment for fleets that prioritize uptime, compliance, and driver satisfaction. Built by Navistar, these trucks integrate well with fleet tracking and predictive maintenance systems—making them as intelligent as they are tough.

Need International Repair Service?

Need reliable repairs for your International truck? Call Iron Buffalo at 303-623-7049 (Denver) or 406-890-7001 (Kalispell). We’ll restore power, performance, and compliance.

FAQs

What Areas Do You Serve?

We offer 24/7 mobile repairs and roadside assistance in the following areas:

Colorado: Boulder, CO; Aurora, CO; Centennial, CO; Fort Collins, CO; Greeley, CO; Georgetown, CO; Brighton, CO; Castle Rock, CO; Colorado Springs, CO; and Longmont, CO.

Montana: Whitefish, MT; Bigfork, MT; Somers, MT; Polebridge, MT; Thompson Falls, MT; Polson, MT; Rollins, MT; Libby, MT; and Eureka, MT.

What International Models Do You Repair?

We repair all International models, including ProStar, LT, HX, HV, RH, and older 4300/4400 series trucks, both MaxxForce and Cummins-powered.

Can You Clear International Fault Codes and Perform Regens?

Yes. We use OEM-level tools to read and clear Navistar fault codes and initiate forced regens and DPF diagnostics as needed.

How Can I Get in Touch?

If you're ready to schedule diesel repairs, call Iron Buffalo today at 303-623-7049 (Denver) or 406-890-7001 (Kalispell).

Manufacturers

Customer testimonials

Leave a Review

"I highly recommend this shop. I had luke a technician there do some work on my truck after a ford dealership took 6 days and failed to acknowledge my warranty on 3 leaking oil spots on my truck.Once the dealership screwed me over I took my truck here. Luke was very impressive, fast and communicative. He provided me photos. He kept me updated on everything he did. I still have a warranty through ford but apparently it’s useless. I don’t think I’ll ever go back to them considering how they treated me. Luke is a solid technician who is very skilled. I can’t recommend him enough. Thank you."

Tristen

"Our truck broke down just as we were getting into Denver. It was a major repair and they accomplished it quickly and we were back in our truck. Everyone there was very professional and nice to work with. The unhappy news of a major repair was actually a good experience. Definitely recommend Iron Buffalo."

Kelly

"I’m glad I went to this shop. I was so worried it would be another back door mechanic wanting to swindle me. It was anything but. Shannon was super kind and went way out of his way getting me in right away. And Steve was a professional from start to finish in assisting with the work being done. I’m really appreciative and would 100% use this shop again."

Kristin

"Steven Riddle is the best service writer if ever dealt with. He is very knowledgeable, I called with starting issues. With in 1hour try had my truck towed in. That day they had it diagnosed then next day they found the parts. Great job, I will be using in the future. Thanks a lot."

Mike

"Kanisha was great, I had been trying to get my small hydraulic cylinder repaired for quite some time and she was the first person that said "YES" she was honest about needing to look first. She was willing to listen and explained the process. When I came in she was polite and professional. She communicated like she said she would and got it taken car of! I'll recommend Kanisha and Iron Buffalo!"

Lance

"I'm very happy with the service I received from Iron Buffalo Holdings I highly recommend this shop. I got an Inspection & a DYNO done on my Semi Truck. Canesha was prompt and courteous."

Miko

"Had a break down with the ol’ Pete they picked up and were available l. They aren’t the cheapest but heck you get what you pay for. If you want your rig or RV fixed so you can head one down the road these guys are nice and they can almost always get done in a day if you need it."

Bryan

Light, Medium & Heavy-Duty Truck Repair Services in Denver, CO & Kalispell, MT

Trusted Diesel Repair & Fleet Services - Keeping You on the Road & Job Site

Commerce City, CO

5590 E 55th St, Commerce, City, CO

303-623-7049

Kalispel, MT

104 Rocky Cliff Lane, Unit 1, Kalispell, MT

406-890-7001