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14 Companies That Specialize In Diesel Conversions

Cummins 4bt In A Jeep
Ken Brubaker
| Senior Editor, Four Wheeler
Posted August 1, 2012

Go Diesel

Do you drool over diesels? Well, if you’d like to convert your gas-powered rig to diesel power, there are actually a surprising number of companies that specialize in these conversions. Some offer problem-solving parts and kits, others offer complete in-house conversions, and a few offer the whole enchilada with parts, kits, and the option of a complete in-house conversion.

Following is a list of companies that can help you complete a diesel conversion. We’ve tried to include companies that cover a wide range of makes and models of trucks and SUVs. Some of the engine swaps are mainstream, while others use the less prevalent Toyota, Mercedes-Benz, and Volkswagen diesel engines.

So if you’re in the market to go diesel, start here.

Bruiser Conversions
Getting a Cummins 4BT in your Jeep CJ, YJ, TJ, or JK is as easy as dropping your rig off at Bruiser Conversions. You can choose from two automatic transmissions and one manual transmission. If you wish to complete the conversion, the company offers components to install a 4BT into your CJ, YJ, or TJ. There are a slew of upgrades available as well.
Contact: 727/709-0239,

Mash Motors
How about Duramax LBZ power under the hood of your Hummer H1, H2, or large GM SUV? Well, Mash Motors can make it happen. The in-house conversion includes an Allison M1000 heavy-duty six-speed automatic transmission, two-speed part-time transfer case, Duramax wiring harness, modified ECM, custom 4-inch-diameter exhaust, and much more. Performance upgrades include a head stud kit, 60 psi turbo, power programmers, water injection, propane injection, high-flow fuel injectors, and more. Mash Motors says build time is approximately 45 days for a H1 and 25 days for the H2.
Contact: 316/617-2472,

HPA Motorsports
Got a Jeep YJ or TJ? If you’d like the benefits of a Volkswagen TDI engine you can either purchase one of HPA Motorsports do-it-yourself kits or you can let the company complete the conversion in-house. The DIY kits are available in two stages. Stage 1 is a bare bones grouping that is intended for those who wish to take on the fabrication and plumbing of the TDI’s boost track, gas pedal fitment, and so on, and have the resources available to tune the engine software around their final configuration. Stage 2 builds on the Stage 1 package, adding the engineered air-to-water intercooling system, a performance ECU tune that has reconfigured the injection around the ultra-efficient boost track, a bracket for the gas pedal fitment, and key coolant line fittings to better facilitate the Volkswagen cooling system. HPA mates the VW turbodiesel engine to specific manual transmissions and the company is developing a kit to install the engine in the Jeep JK.
Contact: 604/598-8520,

If you want to replace the Power Stroke turbodiesel in your Ford truck with a Cummins turbodiesel, Destroked has a wide range of components to make it happen. The company has motor mounts, engine controllers, fan shrouds, alternators, throttle accessories, flex plates, and starters, among other things. Destroked also offers a wide variety of adapter plates to mate the Cummins’ engines to a variety of transmissions including Ford and ZF and even GM and Allison. The company also offers a stand-alone controller for the Allison transmission as well as Ford and GM transmissions. Contact: 720/897-7477,

Predator Inc.
Those of you with a Hummer H1 or H2 can have Predator Inc. fit your rig with a Duramax/Allison combination. The conversion includes a part-time two-speed transfer case, intercooler, fuel cooler, Duramax wiring harness, modified ECM, and “several hundred other items that go into the massive conversion process.” If you have an H1 you also have the option of a Cummins 6BT with either an Allison or 4L80E transmission. With each conversion there are a significant number of performance upgrades available.
Contact: 877/733-2867,

Jeff Daniel’s Jeep Customizing
If you want to put a Cummins 4BT diesel engine into your Jeep CJ, YJ, TJ, or JK, Jeff Daniel’s Jeep Customizing has the components needed to complete the swap. The company says it’ll take you about 60 hours to complete the conversion. Components can be purchased from the company either as a kit or al a carte. The engine and transmission is not included, but the company says it can help locate them. Jeff Daniel’s Jeep Customizing offers cool components like engine mounts that are designed to absorb the vibration of the engine as well as provide a simple install. The company also offers a slew of parts and accessories including adapters, bellhousings, and flywheels.
Contact: 215/256-8090,

Diesel Toys
This company makes it possible to dieselize your ’05-and-up Toyota Tacoma, FJ Cruiser, or 4Runner. Diesel Toys has been performing turnkey installations of modern, computer-controlled, factory turbodiesel powerplants since 2002. Kits include a complete, low-mileage, factory Toyota 1KD-FTV four-cylinder turbodiesel engine; four-speed automatic or five-speed manual transmission; and a Diesel Toys installer kit that includes installation DVD, badges, CNC-machined motor mounts, fuel system bracket/line kit, fan shroud, and proprietary plug-n-play wiring harness. Additional items are required and you can see the website for a complete list. Diesel Toys also offers diesel conversions for the Jeep TJ (using a Toyota turbodiesel) and the Jeep JK (using a VM Motori turbodiesel).
Contact: 877/545-8699,

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