CMC Diesel went the extra mile!

I called upon these good folks in my hour of need, Friday afternoon. I was passing through and they said to bring it right in. I arrived and they pulled me right on in. Within minutes, they had my issue properly diagnosed and had put the parts wheels in motion. Big Timber is out there, so they had to pull parts from the East and the West. All said and done, CMC Diesel had me in and out the door in under 6 hours. They went the extra mile to source my parts FAST and stayed after hours to get me back on the road, with a top notch repair. Thank you Clay and crew for what you do. You are my new Montana go to!  - Ben R.

Building it better-that's why we use JASPER!

Breaking News! JASPER installs New Dynamometer for Long Range New Product/ Authentic Engine Testing. CMC Diesel in Big Timber is a proud partner with a company that is working to lead the way in the next generation of engine testing.  Jasper is always on a mission to design impeccable products that will keep them ahead of the competition and work best for their customers.  What is this new progression you ask? Jasper Engines and Transmissions has installed a computerized dynamometer that will help improve new products and for use with Jasper Authentic Custom Drivetrain division.

Fair pricing and excellent work!

Blew a head gasket on my 2011 Dodge 2500. Explained previous shop repaired it, what I wanted from my truck, and never for this to happen again. Clay listened! He gave me fair pricing, excellent work, and fair timing for what was being done. His knowledge and recommendations of what I requested gave me the truck and power I've needed. Excellent customer service from this shop and employees in Big Timber, MT!!! - Damon B.

Custom Ford 302 Engine


What a beauty. This JASPER Remanufactured Ford 302 engine is very cool, it includes custom paint, intake and valve covers. Plus a 3 Year | 100,000 Mile Nationwide Parts & Labor Warranty. Stop by and talk to us here at CMC Diesel in Big Timber about your vehicle restoration project or any car or truck engine that you are having issues with.  If we can't fix it then a JASPER remanufactured engine may be a great fit for you. BUILT IN THE USA - Celebrating 75 Years in 2017!

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CMC Diesel

location small1008 East 1st Ave
Big Timber, MT 58011


CALL:  (406) 932-5021

Shop Hours

Weekdays:   8:00 AM - 5:30 PM
Saturdays: CLOSED