June 29


Frequently asked questions about the Cummins 4BT swap

Cummins 4BT jeep conversions are engine conversions done by automotive mechanics. It makes more power when the engine is switched to a 4-cylinder diesel engine. Early models only had one gear, so you needed an automatic transmission; most later models have three gears and can also be used with manual transmissions. Cummins 4BT jeep conversions are excellent for off-road driving due to their four-piston low-pressure design.

Why Do People Swap Their Engines?


A new or remanufactured Cummins engine will cost you less than half what you would pay for a new 4.0L Jeep power plant. That puts your savings in the thousands!

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The original Jeep Wrangler engines were designed for optimal fuel economy—not maximum torque or horsepower. Cummins has increased power without sacrificing reliability or longevity like other aftermarket options today with its turbocharger and computer chip-tuned programming.


Other engines are available in different sizes but still use similar technology—such as swapping from one displacement size down to another. With Cummins, you can customize it the way you want.

What’s the Difference Between a 4BT and a 2.8L CRD Conversion?

The difference between these two conversions is not only in their size and performance but also in the installation. If you’re planning to install an aftermarket conversion yourself, you’ll need to keep this information in mind when purchasing parts or choosing how to build your system entirely from scratch.

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What are the Pros and Cons of 4BT Jeep Swaps?


The 4BT is a good engine for off-road driving. It has a lot of torque and power at low RPM, which is excellent for pulling heavy loads or climbing steep hills.

Parts are readily available for this engine because it’s one of the older ones still used today. You’re less likely to be stuck with an expensive part you can’t find anywhere else.

The 4BT makes a good tow vehicle because of its high torque and low RPMs compared to other engines. You’ll be able to haul heavy loads without any problems.

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This won’t be the best option if your Jeep has any rust issues around where the new engine will go. That is because some parts may need modifications before installation becomes possible. Having no rust means that those parts won’t have trouble fitting in later down the road.

Is a 4BT Swap Difficult to Do?

The 4BT Jeep Swaps are not as tricky as other engine swaps as the unit incorporates an automatic transmission. It also has been designed to fit into the TJ Wrangler. You don’t have to worry about getting a manual transaxle, transmission cross member, etc. The only thing you will need to do is bolt it up and run your harnesses.

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What Needs to be Done Before I Can Start Work?

First, you’ll have to remove the old engine. You can do this in two different ways. You can either remove the transmission from the motor or pull them together.

Make sure you have a way to back up your Jeep when removing this assembly so that it doesn’t roll into traffic during removal. The transmission will also help pull back on this assembly because of its weight and center of gravity.

Cost of a 4BT Jeep Conversion (Approximately)?

The cost of converting your Jeep is going to be different for everyone. The factors that affect the price range from the kind of 4BT you choose to buy and install, whether or not you do all the work yourself, and how much money you want to spend on labor.

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Here are some ballpark costs:

  • $2000-3000 for simple conversions
  • $4000-5000 for more complex conversions with custom parts

Before you buy a 4BT and start tearing it apart, take the time to consider the pros and cons of this engine swap. The good news is that there are many benefits to converting your Jeep Wrangler TJ into a Cummins 4BT-powered vehicle.

You will have more power, better fuel economy, and increased reliability. On the other hand, you may spend too much money on parts, or you may not have enough time to complete the project yourself.

If you want to give your Jeep a new look and feel, consider investing in a 4BT engine swap. It’s affordable and reliable, which means less maintenance for you as a driver.

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