A Complete Guide to An LS Swap Bronco Conversion

Are you looking to breathe new life into your classic Ford Bronco? An LS swap Bronco conversion might be the answer you’ve been searching for. 

With improved performance, compatibility, and ease of installation, it’s no wonder LS-swapped Broncos are gaining in popularity. Let’s take a look at what an LS swap for Broncos can do for you and discover how you can take your vehicle to the next level with an LS engine upgrade.

I’ve talked to the owners of the gray one below and let me tell you, they love it! Looks mean too.

LS Swap Bronco Conversion with Kincer Chassis

Key Takeaways

  • LS swaps offer increased power and efficiency for classic Ford Broncos, with Kincer Chassis providing custom frames and suspension/drivetrain upgrades.
  • Essential components such as motor mounts, wiring & electronics, cooling & exhaust systems must be considered to ensure a successful LS swap.
  • Common challenges including transmission compatibility and suspension/steering upgrades can be addressed with the right approach.

The LS Swap Phenomenon: Why the Classic Bronco?

The LS engine sold by Lokar, a Chevy motor produced by General Motors, has become a popular choice for engine swaps in classic cars like the Ford Bronco. Known for its power, versatility, and affordability, the LS engine presents an excellent value for money.

I’ve talked with the people at Lokar and while they don’t see a lot of LS swaps in Early Broncos, they know of a few and they said it really helps you stand out in a crowd when you pull up to a car show in a Bronco that doesn’t have a Ford engine. Good or bad? You decide. I say as long as it’s a conversation starter and everyone can be nice, then it’s all good.

So, what makes the classic Ford Bronco an ideal candidate for an LS swap?

LS Engine by General Motors Swap in Ford Bronco

Performance Advantages

An LS-swapped Bronco offers several performance advantages over the original vintage Bronco engine. The LS engine has an increased horsepower and torque rating, contributing to better acceleration and overall performance. Those older engines just can’t keep up with the modern performance, and that’s okay. They weren’t really meant to at the time.

In reality, the LS swap provides a modern and powerful driving experience, making your classic Bronco a head-turner on the street.

Compatibility and Ease of Installation

In the context of swapping engines, compatibility plays a significant role. Fortunately, the LS engine is known for its compatibility with classic Ford Broncos, thanks to bolt-in motor mounts and adapters specifically designed for this purpose. 

The LS engine’s wiring system can be integrated into the Bronco’s existing wiring harness.

With the proper components and guidance, an LS swap in a classic Bronco can be a rewarding project (if you do it yourself, that’s awesome, me – this is one I’m leaving to the pros) that ups your vehicle’s performance and capabilities.

1975 Ford Bronco with an LS Swap

Early Ford Bronco Chassis Offerings

Kincer Chassis provides a range of features for early Bronco LS conversions, including:

Their chassis offerings can improve your ride quality and overall value, ensuring your Bronco performs at its peak on and off the road. I talk about Kincer all the time. You know I love those guys!

Essential Components for a Successful LS Swap

For a successful LS swap in a Bronco, a few vital components are required. These include motor mounts and adapters, wiring and electronics, and cooling and exhaust systems. 

Recognizing the importance of these components and making sure you buy the right parts is fundamental for the success of your LS swap project.

Motor Mounts and Adapters

Selecting the right motor mounts and adapters is a critical step in an LS swap.

Bolt-in motor mounts designed for installing GM LS-based engines into Ford Broncos provide a secure and stable connection between the engine and the vehicle chassis. Obviously important.

These mounts and adapters make for an easier installation process, making sure your LS engine is properly seated within the Bronco’s engine bay.

A rugged Ford Bronco with oversized tires parked under a bridge, its powerful stance accentuated by the urban graffiti backdrop

Wiring and Electronics

Correct wiring and electronics are pivotal for incorporating the LS engine into your Bronco’s pre-existing electrical system. The wiring harness should be compatible with both the LS engine and the vehicle’s electrical system to ensure all necessary connections are made and the engine operates efficiently and reliably.

Wiring and electronics are vital in controlling engine functions, such as fuel injection, ignition timing, and emissions, making them a critical component in a successful LS swap.

Cooling and Exhaust Systems

Confirming that suitable cooling and exhaust systems are in place is important for the performance and lifespan of your LS-swapped Bronco. 

Upgrading the cooling system guarantees that your new LS engine runs at its most efficient temperatures, preventing overheating and potential damage.

Additionally, aftermarket exhaust options can be utilized to boost performance and create the desired sound (something I’ve found is hit or miss in the car world – some people just don’t like loud vehicles and others can’t make them loud enough!), further enhancing the driving experience of your LS-swapped Bronco.

Real-Life LS Swap Bronco Projects

There are numerous examples of successful LS swap projects in both street-ready and off-road Broncos.

All the photos on this post are from a family I know that owns this Bronco. Can’t wait to take a trip to see them and get to drive it. I’d love to see how it compares to a Coyote Bronco.

Street-Ready LS Bronco Builds

Street-ready LS Bronco builds usually focus on creating a daily-driver vehicle that provides a balance of performance and comfort for on-road use.

Examples of successful street-ready LS swap Bronco projects include projects posted on YouTube, this Bronco found on Bring a Trailer, and discussions on the Full Size Bronco forum about successful GM LS swaps in full size Broncos.

It’s a hot topic. You could go down a rabbit hole if you wanted to.

These Bronco builds demonstrate the potential of an LS-swapped Bronco as a powerful and enjoyable street machine.

Retro Meets Modern - LS-Swapped Ford Bronco Ready for Action.jpg

Off-Road LS Bronco Conversions

Off-road LS Bronco conversions focus on optimizing off-road capabilities, such as increasing torque and horsepower, integrating heavy-duty components, and optimizing suspension and traction.

I’ve never seen an off-road Bronco with an LS but I’ve heard that they do exist. If you see one, let me know in the comments!

Common Challenges and Solutions for LS Swaps in Broncos

Like any engine swap, performing an LS swap in a Bronco can present challenges. However, with the right approach and understanding of potential issues, these challenges can be overcome, ensuring a successful and rewarding LS swap project and happy driving for years to come.

Transmission Compatibility

A common hurdle during an LS swap is confirming the compatibility between the LS engine and the selected transmission for the Bronco. It’s necessary to investigate and verify the compatibility between the LS engine and the transmission to avoid any complications.

Adapters and conversion kits, incorporating new technology, are available to help address transmission compatibility issues, allowing for a seamless swap process.

Suspension and Steering Upgrades

Upgrading suspension and steering components is significant to handle the increased power of an LS-swapped Bronco. The extra weight of the LS engine may put additional strain on the suspension components, potentially causing a decrease in ride quality and handling.

Upgrading the suspension can help accommodate the added weight and ensure proper alignment and steering geometry, providing a smooth and enjoyable ride in your LS-swapped Bronco. Our friends at Kincer are selling the semi-active TracTive off-road shocks and if you’ve not driven with them you really should try to go there and feel the difference.


In conclusion, an LS swap in a classic Ford Bronco offers numerous benefits, including improved performance, fuel efficiency, and compatibility. By understanding the essential components, partnering with companies like Kincer Chassis and Lokar, and addressing common challenges, you can successfully transform your classic Bronco into a powerful and enjoyable vehicle for both on-road and off-road adventures.

Frequently Asked Questions

Can you put a V8 in a Classic Bronco?

Many Classic Broncos came with a 302 V8. The Early Bronco can fit newer V8s as well like the Coyote Engine and an V8 LS swap.

What are the performance advantages of an LS-swapped Bronco?

An LS-swapped Bronco delivers better horsepower, torque, and fuel efficiency than the original engine, resulting in a more powerful and efficient ride.

What components are necessary for a successful LS Swap in a Bronco?

For a successful LS Swap in a Bronco, motor mounts and adapters, wiring and electronics, and cooling and exhaust systems are all necessary components.

What are some common challenges in performing an LS swap in a Bronco?

Common challenges of performing an LS swap in a Bronco include clearance issues and confirming the correct fitment of the motor.

How can I ensure proper transmission compatibility during an LS swap in a Bronco?

To ensure proper transmission compatibility for an LS swap in a Bronco, research the LS engine and the transmission to identify any compatibility issues, then use adapters or conversion kits to address them.

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