Diesel Conversions


Duramax Diesel Engine Conversions for the Hummer H1, H2 and Large SUVs

Mash Motors Inc. is world-renowned for our Duramax Diesel conversions for the Hummer H1, H2 and large SUVs 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.

With a conversion from Mash Motors Inc., you won’t lose any of your factory accessories and all wiring is completed in a manner that allows your factory settings to be maintained.

2008-2009 Hummer H2

Starting at $29,500

  • A complete replacement of your vehicle’s factory power train to the 6.6 Liter LMM Duramax Turbo Diesel Engine
  • Allison M1000 heavy-duty 6-speed automatic transmission
  • Allison M1000 heavy-duty 6-speed automatic transmission
  • Turbo inter cooler
  • Radiator
  • Oversized fan and fan clutch
  • Oversized transmission and engine oil cooler
  • New rear drive shaft
  • New front drive shaft
  • New motor mounts
  • Custom high-flow, 4-inch exhaust
  • Custom high-flow cold air intake system
  • New diesel speedometer
  • New fuel lines – bio diesel ready
  • All necessary fluids, hoses and hardware
  • Drivetrains used in conversion will be used pullouts with aprox 60-80k miles
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2003-2007 Hummer H2

Starting at $28,500

  • A complete replacement of your vehicle’s factory power train to the 6.6 Liter LBZ Duramax Turbo Diesel Engine
  • Allison M1000 heavy-duty 6-speed automatic transmission
  • NP HD transfer case with 2HI, 4HI, 4LOW
  • Turbo inter cooler
  • Radiator
  • Oversized fan and fan clutch
  • Oversized transmission and engine oil cooler
  • New rear drive shaft
  • New front drive shaft
  • New motor mounts
  • Custom high-flow cold air intake system
  • New diesel speedometer
  • All necessary fluids, hoses and hardware
  • Drivetrains used in conversion will be used pullouts with aprox 60-80k miles
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2003-2013 GM 2500/3500 Large SUV

Starting at $29,500

  • 6.6 Liter Duramax Turbo Diesel Engine
  • Allison M1000 6 Speed Automatic Transmission
  • NP HD Transfer Case W/ 2HI, 4HI, 4LOW
  • New Turbo Inter cooler
  • New Radiator
  • Over sized Fan, and Fan Clutch
  • Over sized Transmission and Engine Oil Cooler
  • New Rear Drive Shaft
  • New Front Drive Shaft
  • New Motor Mounts
  • New Transmission Mount
  • Custom High Flow Exhaust 4 Inch
  • Custom High Flow Air Intake
  • New Diesel Speedometer
  • New Fuel Lines Bio-Diesel Ready
  • All Necessary Fluids, Hoses, and Hardware.
  • *Drivetrains used in conversion will be used low mileage pullouts (average miles 25K)*
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2015-2017 GM 3500 Suburban

Starting at $32,500

  •  6.6 Liter L5P Duramax Turbo Diesel Engine
  • Allison 1000 Automatic Transmission
  • NP HD Transfer Case W/ 2HI, 4HI, 4LOW
  • New Turbo Inter cooler
  • New Radiator
  • Over sized Fan, and Fan Clutch
  • Over sized Transmission and Engine Oil Cooler
  • Rear Drive Shaft
  • Front Drive Shaft
  • New Motor Mounts
  • New Transmission Mount
  • Custom High Flow Exhaust 4 Inch
  • Custom High Flow Air Intake
  • New Diesel Speedometer
  • New Fuel Lines Bio-Diesel Ready
  • All Necessary Fluids, Hoses, and Hardware.
  • *Drivetrains used in conversion will be used low mileage pullouts (average miles 10K)*
  • *If you prefer to use new diesel drivetrains the cost will be an additional $14,750.00*
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Horsepower and MPG Expectations

The base conversion package starts out with 400 horsepower. Performance upgrades and modifications can increase the horsepower to 750. The biggest gain from the conversion is the outstanding fuel mileage from 9 to 12 MPG in a stock Hummer to 18 to 26 MPG and is capable of running on biodiesel.

Build Time

Each conversion is completed to the customer’s specific requests and therefore, build time is approximately 45 days for the H1, 25 days for the H2 and SUVs. This ensures that each conversion is completed properly and the vehicle has been thoroughly inspected and road tested prior to delivery.

Diesel Drive Train Core Charge

Mash Motors Inc will retain the old drive train and components that are removed from your vehicle during the conversion process. The stock motor and transmission will be used as a core charge for the diesel engine and Allison transmission. If you want to retain the stock motor and transmission there will be a core charge of $2,500.00 added to the conversion cost.