Building your trust while we rebuild your components.


RMPT specializes in…

[ We do not specialize in fixing your mom’s mini-van. ]


HD Diesel Engine Machine Shop Services

Rocky Mountain Powertrain offers a full service engine machine shop for heavy duty diesel engines.  We offer services for the following:

  • Engine blocks

  • Crankshafts

  • Connecting rods

  • Cylinder heads


Powertrain Component Overhauls

Rocky Mountain Powertrain specializes in off-highway transmissions, axles, and PTO’s.  This includes but not limited to the following:

  • Carraro

  • CAT

  • Clark-Dana-Spicer

  • Cotta

  • Durst

  • Funk

  • John Deere

  • Twin Disc

  • ZF’s

Building and testing components included as a part of our service package.


Diesel Engine Overhauls

Rocky Mountain Powertrain delivers quality engine overhauls.  The expertise, quality work, and customization to your needs make us a far superior choice to an average engine exchange.

We are an authorized service center for several OEM manufacturers. 

Our people have combined industry experience of 150+ years.


we work on most makes & models, but we are an authorized service center for:

  • Palmer Johnson Power Systems

  • Twin Disc

  • Perkins

  • Volvo-Penta

On average, we can save you roughly 20% of what the dealership is charging.



The Family That Builds Together…

Rocky Mountain Powertrain, LLC is a family-owned and operated business that opened its doors in October 2008 in the Metro Denver Area. Owner, Matt Ayriss, has more than 20 years of experience both in the shop and in the field. His love for the industry started back when he was a teen working on tractor equipment on a farm.

In May 2015, his brother Dan Ayriss, joined as the Operations Manager. Dan has management experience with a fortune 100 company and works to keep operations running smoothly.


You’ll love working with Matt and Dan! They are the absolute best!


Rocky Mountain Powertrain was founded on the core values of customer service and honest hard work. We provide expert knowledge and service for your powertrain repairs. Our goal is to take care of YOU the customer in a cost-effective way. We value the importance of our relationships and will continue to remain fair and true in all our dealings with clients, vendors, and partners. We want to ensure the longevity of our company through repeat and referral business achieved by customer satisfaction.