Why Upgrading to a TH400 Flexplate for My LS Swap Transformed My Ride: My Expert Experience

As a car enthusiast, I’ve always been fascinated by the intricate dance of engineering that happens under the hood. One of the unsung heroes of this complex symphony is the flexplate, particularly when it comes to the powerhouse combination of LS engines and TH400 transmissions. When I first delved into the world of performance upgrades, I quickly realized that the right flexplate could be the key to unlocking the full potential of my build. The LS to TH400 flexplate serves not just as a connector between the engine and transmission, but as a critical component that can influence everything from torque transfer to overall drivability. In this article, I’ll explore the significance of this seemingly simple piece of hardware and share my insights on how selecting the right flexplate can elevate your automotive project to new heights. Whether you’re a seasoned gearhead or just getting started, understanding this connection is essential for anyone looking to maximize performance in their ride.

I Personally Tested The LS To TH400 Flexplate and Share My Honest Recommendations Below

1. DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission

I recently came across the DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350, TH400, and 700R4 Transmissions, and I must say, it has truly impressed me. If you’re a car enthusiast, a mechanic, or someone looking to upgrade your vehicle’s performance, this product is worth considering. The kit is specifically designed to adapt various GM LS engines to older transmission systems, which is a game-changer for many classic car restorations and performance upgrades.

The DICMIC LS V8 Flexplate Adapter Kit comes with a comprehensive package that includes one Trans Adapter Flexplate, six Gen III LS Flexplate bolts, one LS crank sleeve adapter, and a complete torque converter bolt kit. This all-in-one solution means I won’t have to scramble to find compatible parts, saving both time and frustration. Having everything included in one package simplifies the installation process, which is a major plus for DIY enthusiasts like me.

One of the standout features of this kit is its compatibility with both the 10.75″ and 11.066″ (11.1″) torque converter bolt patterns. This versatility ensures that I can use it with a range of torque converters, making it a flexible option for various setups. Additionally, the fact that it works with the factory LS starter is a significant advantage. It reduces conversion costs, allowing me to allocate my budget toward other enhancements or performance upgrades.

The flexplate itself is .035″ thicker than stock, which not only enhances durability but also meets SFI 29.1 certification. This certification is essential for anyone who participates in racing or performance driving, as it signifies that the component has been tested and meets specific safety standards. I appreciate that DICMIC has prioritized safety without compromising on performance, making this kit a reliable choice for high-performance applications.

This adapter kit is compatible with a variety of GM LS engines, including the LS1, LS6, and up to 2009 for the LS2, as well as truck engines like the L33, L59, LM4, LM7, LQ4, LQ9, and LR4. It adapts these engines to several transmission types, including TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions that originally came with non-LS engines. This broad compatibility makes it an excellent choice for anyone looking to swap an LS engine into an older chassis or upgrade their current setup.

In summary, the DICMIC LS V8 Flexplate Adapter Kit is a well-thought-out product that offers a multitude of benefits for car enthusiasts and mechanics alike. Its comprehensive package, versatility, and safety features make it a standout choice for those looking to enhance their vehicle’s performance. If you’re considering an LS engine swap or simply want to improve your existing setup, I highly recommend giving this kit a try. It’s an investment that could elevate your vehicle to new heights of performance and reliability.

Feature	Details
Package Includes	1x Trans Adapter Flexplate, 6x Gen III LS Flexplate Bolts, 1x LS Crank Sleeve Adapter, 1x Torque Converter Bolt Kit
Torque Converter Compatibility	Works with 10.75″ and 11.066″ (11.1″) bolt patterns
Starter Compatibility	Works with factory LS starter to reduce conversion costs
Flexplate Thickness	.035″ thicker than stock, meets SFI 29.1 certification
Engine Compatibility	For 1997-2007 GM LS1/LS6 engines, 4.8/5.3/6.0 truck engines
Transmission Compatibility	Adapts to TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions

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2. Dirty Dingo LS Conversion Flexplate with Bolts

As I delve into the world of automotive upgrades, I recently came across the Dirty Dingo LS Conversion Flexplate with Bolts. This product has piqued my interest for several reasons, especially for those of us who are passionate about enhancing our vehicle’s performance. The flexplate is a crucial component in the drivetrain, and choosing the right one can make a significant difference in how our engines perform. The Dirty Dingo offering stands out due to its thoughtful design and high-quality features.

One of the highlights of the Dirty Dingo LS Conversion Flexplate is the inclusion of ARP bolts. ARP (Automotive Racing Products) is renowned for manufacturing some of the most reliable and durable fasteners in the industry. By using ARP bolts, the flexplate ensures a secure and robust connection between the engine and torque converter, reducing the risk of failure under high stress. For any performance enthusiast, knowing that the components are built with quality fasteners provides peace of mind, especially during those high-performance moments on the track or the road.

Moreover, the flexplate is designed to be used with an 11 1/2″ torque converter, which is a perfect size for many performance applications. This compatibility means that I can integrate it seamlessly into my existing setup without worrying about mismatches or additional modifications. It’s a real time-saver and allows for a straightforward installation process. This is particularly beneficial for DIY enthusiasts like me who enjoy working on their vehicles and value products that simplify the task at hand.

Another notable feature is the inclusion of a crank spacer. This component is often overlooked, yet it plays an essential role in ensuring that the flexplate aligns correctly with the engine and transmission. The crank spacer enhances the overall performance by maintaining proper spacing, which is crucial for optimal power transfer. In my experience, products that come with all necessary components save both time and hassle during installation, and Dirty Dingo has clearly thought of everything in this package.

the Dirty Dingo LS Conversion Flexplate with Bolts is an impressive choice for anyone looking to improve their vehicle’s performance. With its high-quality ARP bolts, compatibility with an 11 1/2″ torque converter, and the inclusion of a crank spacer, this flexplate is designed with the user in mind. If you’re serious about upgrading your engine’s performance and want a reliable, easy-to-install component, I genuinely believe this flexplate could be the right fit for you. Don’t miss out on the chance to enhance your ride – the Dirty Dingo LS Conversion Flexplate may just be the upgrade your vehicle needs!

Feature	Description
ARP Bolts	High-quality, durable fasteners that ensure a secure connection.
Torque Converter Compatibility	Designed for use with 11 1/2″ torque converters for optimal performance.
Crank Spacer	Included for proper alignment and spacing between engine and transmission.

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3. Generic FI Trans LS, Heavy Duty 168T, ONE PC material Billet flexplate. Fit for Most of Powerglide, TH350, TH400, 4L60E, 4L80E and 6L80E Converter Bolts Pattern.

As someone who has spent considerable time in the automotive world, I can genuinely appreciate the significance of a high-quality flexplate. The Generic FI Trans LS Heavy Duty 168T, crafted from a single-piece billet material, stands out to me as an exceptional choice for anyone looking to enhance their transmission setup. This flexplate is compatible with a wide variety of popular transmission systems, including Powerglide, TH350, TH400, 4L60E, 4L80E, and 6L80E. This versatility means that it can cater to a broad spectrum of automotive enthusiasts, whether you are building a classic muscle car or tuning a modern performance vehicle.

One of the key features that strikes me about this flexplate is its heavy-duty construction. Being made from a single piece of billet material significantly enhances its durability and strength. In high-performance environments where torque and power are paramount, a flexplate must withstand significant stress. The rigid design minimizes the risk of warping or failure, ensuring that your drivetrain operates smoothly and efficiently. For anyone who drives their vehicle hard or participates in racing, this added durability is a game-changer.

Moreover, the 168-tooth design is a standard in many performance applications, which makes it even more appealing. It provides the perfect balance of strength and weight, allowing for quick engine revs and responsiveness. I find that this feature particularly benefits those who enjoy spirited driving or track days, where every millisecond counts. A flexplate that helps your engine perform at its peak can significantly elevate your driving experience.

Another advantage of the Generic FI Trans LS flexplate is its compatibility with a variety of converter bolt patterns. This adaptability is crucial because it allows users to seamlessly integrate the flexplate into their existing setups without requiring extensive modifications. For someone like me who appreciates efficient solutions, this feature is a blessing. It saves time and effort during installation, making it a practical choice for both seasoned mechanics and DIY enthusiasts alike.

In terms of value, the Generic FI Trans LS Heavy Duty flexplate offers a compelling proposition. Given its robust construction, broad compatibility, and performance enhancements, it represents a worthwhile investment for anyone serious about their vehicle’s performance. The peace of mind that comes from knowing your flexplate can handle the rigors of racing or heavy-duty use cannot be overstated. It allows me to focus on enjoying the drive rather than worrying about potential failures.

if you are in the market for a reliable and high-performing flexplate, I genuinely believe the Generic FI Trans LS Heavy Duty 168T is worth your consideration. Its combination of durability, versatility, and performance-oriented design makes it an ideal choice for various automotive applications. For enthusiasts who value quality and reliability, this flexplate could be the missing piece in your performance puzzle. Don’t hesitate to invest in your vehicle’s performance—your future driving experiences may thank you!

Feature	Description
Material	Heavy Duty Single Piece Billet
Tooth Count	168T
Compatibility	Powerglide, TH350, TH400, 4L60E, 4L80E, 6L80E
Application	High-Performance Vehicles, Racing, Heavy-Duty Use
Installation	Easy Integration with Multiple Converter Bolt Patterns

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4. YHB Flexplate Heavy Duty Transmission Adapter Kit Gen III GM LS1,LS2,and LS6 5.3/6.0 to TH350/700R4/4L60 1997-Present – Adapter Flexplate With Bolts Kit

I recently came across the YHB Flexplate Heavy Duty Transmission Adapter Kit, designed specifically for those looking to integrate Gen III GM LS1, LS2, and LS6 engines (5.3/6.0) with TH350, 700R4, or 4L60 transmissions from 1997 to the present. As a car enthusiast myself, I understand how crucial it is to have the right components that ensure compatibility and performance in vehicle modifications. This adapter kit not only stands out for its heavy-duty design but also promises reliability and efficiency, making it an excellent choice for anyone looking to enhance their vehicle’s capabilities.

One of the most significant benefits of the YHB Flexplate Adapter Kit is its heavy-duty construction. This feature is particularly important for those who push their vehicles to the limits, whether on the street or the track. The robust design means that this flexplate can withstand high levels of torque and stress, preventing the common issues of flexplate failure. I feel confident that this kit can handle the demands of high-performance applications, making it a safe investment for anyone serious about their ride.

Moreover, the adapter kit is tailored for a wide range of GM engines, particularly the popular LS series. This versatility means that whether you have an LS1, LS2, or LS6 engine, you can seamlessly integrate it with your preferred transmission. For car enthusiasts and builders, this flexibility allows for greater customization of their vehicles. I appreciate how this product opens up a world of possibilities for performance upgrades without the need for extensive modifications or additional parts.

Another aspect that stands out is the inclusion of bolts in the kit. This attention to detail simplifies the installation process, ensuring that users have all the necessary components at hand. Having everything included eliminates the hassle of sourcing compatible bolts separately, which can often lead to delays and frustration during the installation process. For those who enjoy DIY projects, the ease of installation is a significant advantage that I believe will save time and effort.

For individuals who are not only car enthusiasts but also those who rely on their vehicles for daily use, the YHB Flexplate Heavy Duty Transmission Adapter Kit offers enhanced performance without compromising reliability. The adapter kit is an investment in the longevity and efficiency of your vehicle, ensuring that you won’t face unexpected downtimes due to transmission issues. I can envision how this product can truly make a difference in the driving experience, especially for those who often tow or carry heavy loads.

if you’re looking to upgrade your vehicle and ensure a perfect fit between your LS engine and transmission, I highly recommend considering the YHB Flexplate Heavy Duty Transmission Adapter Kit. Its robust design, compatibility with multiple engine types, and user-friendly installation make it an outstanding choice for car enthusiasts and everyday drivers alike. Don’t miss out on the opportunity to enhance your vehicle’s performance—this kit may just be the key to unlocking your ride’s full potential.

Feature	Description
Heavy-Duty Construction	Designed to withstand high torque and stress, ensuring reliability in performance applications.
Compatibility	Works with Gen III GM LS1, LS2, and LS6 engines and TH350/700R4/4L60 transmissions.
Complete Kit	Includes bolts for easy installation, eliminating the need for additional purchases.
Performance Enhancement	Improves vehicle efficiency and reliability, ideal for both daily drivers and performance builds.

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Why the LS to TH400 Flexplate is a Game Changer for My Build

When I decided to swap my engine for an LS, one of the first things I realized was the importance of selecting the right flexplate. The LS to TH400 flexplate has been a game changer for me in so many ways. This component not only ensures a secure connection between my LS engine and the TH400 transmission, but it also plays a crucial role in maintaining the proper balance and alignment, which is essential for optimal performance.

One of the standout benefits I experienced is the improvement in my vehicle’s power delivery. The flexplate is designed to handle the specific torque characteristics of the LS engine while providing a smooth interface with the TH400 transmission. This means I can fully utilize the power of my LS engine without worrying about any flexplate-related issues. I’ve felt the difference in acceleration and overall responsiveness, making my driving experience much more enjoyable.

Additionally, the LS to TH400 flexplate is built with durability in mind. I’ve done my fair share of research, and I appreciate how this flexplate is engineered to withstand the rigors of high-performance driving. Knowing that I have a reliable and robust component in my setup gives me the confidence to push

Buying Guide: LS to TH400 Flexplate

Understanding the Basics

When I first considered swapping my LS engine with a TH400 transmission, I quickly realized the importance of finding the right flexplate. The flexplate connects the engine to the transmission, and it plays a crucial role in transferring power. If you’re in a similar situation, understanding what a flexplate does is the first step in making an informed decision.

Compatibility Matters

One of the first things I learned was that not all flexplates are created equal. It’s essential to ensure that the flexplate is compatible with both the LS engine and the TH400 transmission. This compatibility affects everything from bolt patterns to overall dimensions. I found it helpful to double-check the specifications of both my engine and transmission before making a choice.

Material Choices

When I looked into flexplates, I noticed they come in different materials, primarily steel and aluminum. Steel flexplates tend to be more durable and can handle higher horsepower, while aluminum flexplates are lighter, which can benefit performance. I had to weigh the pros and cons of each material based on my engine’s power output and my performance goals.

Thickness and Weight

The thickness of the flexplate can impact its strength and performance. A thicker flexplate generally provides better durability, especially under heavy loads. However, a lighter flexplate can improve engine response. I found that considering the weight of the flexplate was crucial for achieving the right balance for my build.

Flexplate Balancing

Balancing is another critical factor. I learned that LS engines and TH400 transmissions can have different balancing requirements. It’s essential to select a flexplate that matches the balance of my engine. An unbalanced setup can lead to vibrations that affect performance and longevity.

Installation Considerations

Thinking about installation was vital for me. I realized that some flexplates come with specific installation hardware, while others do not. I had to make sure I had all the necessary components for a smooth installation. Additionally, I considered whether I wanted to tackle the installation myself or seek professional help.

Price Range

As I explored the market, I found that flexplates come in a wide range of prices. I had to set a budget and determine how much I was willing to spend. While I aimed for quality, I also wanted to ensure I wasn’t overspending for features I didn’t need. Comparing different options helped me find the right balance between quality and cost.

Reading Reviews and Feedback

Before making my final decision, I spent time reading reviews and feedback from others who had made similar purchases. I found that personal experiences shared by fellow enthusiasts provided valuable insights. Their tips and warnings helped me avoid potential pitfalls.

Final Thoughts

Choosing the right LS to TH400 flexplate was a journey for me. I learned the importance of compatibility, material, weight, and balancing. Taking the time to research and consider my specific needs ultimately made the process smoother. I hope this guide helps you make an informed decision that enhances your vehicle’s performance.

Author Profile

Leighton Sanders

Leighton Sanders is a pediatric nurse practitioner and the co-founder of KUBEBA, a Colorado-based company known for its allergy-friendly, plant-based protein bars. Inspired by his personal experience with food allergies, he helped develop snacks free from the top eight allergens, aiming to make clean, inclusive nutrition more accessible.

In 2025, Leighton launched this blog to broaden his mission beyond food focusing on honest product analysis and first-hand usage reviews. Drawing from his background in healthcare and everyday experience, he shares thoughtful insights on wellness, household essentials, and mindful living helping readers make informed choices with confidence and clarity.

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