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.

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!

Durango - Jeep Grand Cherokee - Dodge RAM 1500, 2500, & 3500 Trucks

We have had many customers who needed a transmissions they could depend on over the years when they had issues and now we have the solution here at CMC Diesel in Big Timber thanks to JASPER Engines & Transmissions!  Just announced is the addition of their Chrysler 65RFE-66RFE remanufactured transmission for the 2012 through current model year for:  Dodge Durango - Jeep Grand Cherokee - RAM 1500, 2500, & 3500 trucks!  Backed by a 3 Year | 100,000 Mile Nationwide Parts & Labor Warranty which is one of the many reasons we recommend them. 

Having problems with your Chevrolet-GMC Yukon, Tahoe, Suburban, 1500 Series Transmission?

We now have a superior solution for the transmission issues in the 2014-2015 model GMC - Chevrolet 1500 series, Suburban, Tahoe, & Yukon trucks and SUV's with our partner JASPER Engines & Transmissions who has delivered a superior GM 6L80E Expanded Transmission product line!  Just announced is the availability of the remanufactured 6-speed transmission for these models which will allow our drivers to KEEP their vehicles longer!  Buying a new Yukon, Tahoe, Suburban or 1500 series is simply not cost effective when you can replace it with a 3 Year | 100,000 Mile Nationwide Parts & Labor Warranty product like JASPER with a 75 year history of working harder and smarter to ensure higher quality remanufacturing of engines, transmissions, and differentials. 

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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