Welcome to Mash Motors Inc.

MASH MOTORS has been in business for over four years and is located in the heart of the Midwest, Wichita, Kansas. We specialize in Duramax Diesel Conversions for the Hummer H1 and H2 and large SUV’s including the Chevy Suburban, Yukon, and Avalanche. We are also the first company to successfully convert the Hummer H3 with the Vortec 6.0 liter engine and 4L60HD transmission by GM.

Also providing the latest in aftermarket parts and accessories to complete your conversion. We can supply your vehicle with any part you have seen, or create a one of a kind look to customize your vehicle using our partner, Absolute Dimensions, a full line machine shop, also located in Wichita, Kansas. We send nothing out to an unknown supplier in hopes that it returns in the condition we expect. Instead, we oversee all products that are machined or manufactured to ensure an exact fit and sleek look for your vehicle.

We Guarantee Your Satisfaction

MASH MOTORS is in the business of providing excellent customer service to all our buyers and completes conversions using the most up to date technology. We provide follow-up service on all of our products and guarantee your satisfaction.

  • Duramax Diesel Engine

  • Allison 6 Speed Transmission

  • Up to 26 MPG

  • 400 to 750 Horsepower

  • Up to 1400 ft/lbs. of Torque

  • Selectable 2/4WD

  • Retain All Factory Options

  • Utilizes all Factory GM Components

  • Serviceable at any GM Authorized Service Center

But you don't have to take our word for it...

"Currently Mash Motors has Hummers driving the roads in Iceland, Finland, Canada, Czechoslovakia, Germany, and of course the United States. Please see our Customer Testimonials page for more information from our recent customers."
Yellow Hummer


"...I not only have a more powerful truck that is a dream to drive but I also gained 52 miles per tank of gas after going through my first full tank of gas since I got it back. This is a huge difference from 3.5 to the 6.0L. This guy takes pride in his work and really knows his stuff. He did a very clean and professional install and I would recommend him and this conversion to anyone who is considering taking their Hummer to the next level. Ride on!" Read More