Transforming My Ride: A Personal Journey with LS to TH400 Flexplate Conversions
When I first delved into the world of automotive performance, I quickly realized that the right components can make or break a build. One of the unsung heroes in high-performance setups is the flexplate, particularly when pairing an LS engine with a TH400 transmission. The LS to TH400 flexplate is more than just a piece of metal; it’s a crucial link that ensures power flows seamlessly from the engine to the drivetrain. In this article, I’ll explore the intricacies of this vital component, shedding light on its significance, the compatibility challenges it addresses, and the enhancements it brings to overall performance. Whether you’re a seasoned gearhead or just starting your automotive journey, understanding the role of the LS to TH400 flexplate can elevate your project to new heights. Let’s dive into the fascinating world of flexplates and discover how they can transform your engine’s potential.
I Personally Evaluated The LS To TH400 Flexplate And Share My Honest Recommendations Below
DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission
Michigan Motorsports Black LS Flexplate 6-Bolt Dished SFI 29.1 High Inertia Design – Fits 4.8L 5.3L 5.7L. 6.0L 6.2L TH350 TH400 700R4 4L60 4L80 6L80
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
1. DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission
When I first came across the DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission, I was immediately intrigued by its potential to simplify the complex world of engine conversions. As someone who enjoys working on vehicles, I know that adapting newer engine technologies to existing transmission systems can often feel like a daunting task. However, this flexplate adapter kit seems to offer a streamlined solution that could make this process much more manageable for enthusiasts and professionals alike.
The features included in this kit are designed to maximize compatibility and reduce conversion costs. The package comes with everything you need to get started one trans adapter flexplate, six Gen III LS flexplate bolts, one LS crank sleeve adapter, and a torque converter bolt kit. This comprehensive set ensures that you won’t have to scramble for additional parts midway through your installation, which is a common frustration for many of us in the automotive community.
One standout feature of this product is its ability to work with both the 10.75″ and 11.066″ (11.1″) torque converter bolt patterns. This flexibility is crucial for anyone looking to adapt various engines without being limited by strict specifications. Additionally, the fact that it works with a factory LS starter helps to further reduce conversion costs. This is particularly appealing for budget-conscious individuals who still want to achieve a powerful setup without breaking the bank.
Another impressive aspect of this flexplate is its thickness. At .035″ thicker than the stock option, it meets the SFI 29.1 certification, which means it has been tested and proven to handle high-performance applications. This certification provides peace of mind, knowing that the product has been designed with safety and durability in mind, especially during high-stress scenarios like racing or heavy towing.
In terms of compatibility, this kit is a dream come true for those with GM LS1/LS6 engines from 1997-2007 (up to 2009 for LS2) and 4.8/5.3/6.0 truck engines, including L33, L59, LM4, LM7, LQ4, LQ9, and LR4. The ability to adapt these engines to popular transmissions such as TH350, 700R-4, 200-4R, 4L60, and Power Glide is a major advantage. This means that whether you’re working on a classic car or a modern muscle machine, you can easily integrate these engines into your builds.
After considering all these points, I genuinely believe that the DICMIC LS V8 Flexplate Adapter Kit is a worthwhile investment for anyone looking to perform an engine conversion. The ease of installation, compatibility with various setups, and assurance of quality make this kit not just a purchase but a significant step towards enhancing your vehicle’s performance. If you’re contemplating an upgrade or conversion, I encourage you to consider this product – it just might be the missing link in your project.
Feature Description 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 Thickness .035″ thicker than stock, meets SFI 29.1 certification Engine Compatibility For 1997-07 GM LS1/LS6 engines and 4.8/5.3/6.0 truck engines Transmission Compatibility Adapts to TH350, 700R-4, 200-4R, 4L60, and Power Glide transmissions
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2. Michigan Motorsports Black LS Flexplate 6-Bolt Dished SFI 29.1 High Inertia Design – Fits 4.8L 5.3L 5.7L. 6.0L 6.2L TH350 TH400 700R4 4L60 4L80 6L80
As a performance enthusiast, I have always been on the lookout for parts that elevate my engine’s capabilities while ensuring reliability. When I stumbled upon the Michigan Motorsports Black LS Flexplate, I knew I had found a product that aligns with both my performance goals and aesthetic preferences. This flexplate is specifically designed to fit a wide range of LS-based engines, including the 4.8L, 5.3L, 5.7L, 6.0L, and 6.2L, making it a versatile choice for anyone looking to enhance their vehicle’s performance. It’s worth noting, however, that it does not fit the LSA, LS9, and the 1999-2000 6.0L models. This comprehensive compatibility makes it an excellent option for most LS engine builds.
One of the standout features of this flexplate is its SFI 29.1 certification, which speaks volumes about its durability and performance under extreme conditions. The 168-tooth configuration and internal balance ensure that it operates smoothly, minimizing vibrations that could lead to premature wear and tear on other components. The 6-bolt flange design provides a secure fit, ensuring that the flexplate remains steadfast even in the most demanding applications. This attention to detail is crucial for performance engines that often operate at higher RPMs and face increased stress.
What truly sets the Michigan Motorsports Black LS Flexplate apart is its high inertia design. This feature is particularly beneficial for drag racers and those looking to improve their vehicle’s launch capabilities. The robust solid flat plate made of cold-rolled steel is engineered for harder launches, which translates to improved 60-foot times—an essential metric for any serious racer. The thicker 4mm center plate not only adds strength but also provides a solid foundation that can handle the punishment of today’s high horsepower engines. In a world where performance parts often compromise durability for weight savings, this flexplate strikes an ideal balance.
Moreover, the aesthetic appeal of the Michigan Motorsports Black Flexplate should not be overlooked. Its attractive black finish, combined with laser-engraved lettering, adds a touch of style to your engine bay. This attention to design is a bonus for those of us who appreciate the visual aspect of our builds just as much as the performance. It’s a product that not only performs exceptionally well but also looks great doing it.
In terms of installation, this flexplate is compatible with various transmissions, including TH350, TH400, 700R4, 4L60E, and 6L80E, when used with a torque converter designed for a “dished” flexplate. This broad compatibility means I can use it in a variety of setups without having to make significant modifications. For someone like me who enjoys customizing and upgrading vehicles, this flexibility is a significant advantage.
if you’re serious about enhancing your LS engine’s performance, the Michigan Motorsports Black LS Flexplate is a worthy investment. Its combination of durability, performance-enhancing features, and aesthetic appeal makes it an outstanding choice for any automotive enthusiast. I firmly believe that this flexplate will not only meet but exceed your expectations, helping you achieve those elusive performance goals. So why wait? Elevate your engine’s potential today with this exceptional product!
Feature Description Model Compatibility Fits LS Based Engines (except LSA, LS9, 1999-2000 6.0L) SFI Certification SFI 29.1 Certified for extreme duty applications Tooth Count 168 Tooth for smooth operation Design High Inertia with a 4mm thick center plate Transmission Compatibility TH350, TH400, 700R4, 4L60E, 6L80E Material Cold-rolled steel for durability Aesthetic Black finish with laser-engraved lettering
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3. 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
As a car enthusiast and someone who loves the thrill of performance upgrades, I can’t help but feel excited about the YHB Flexplate Heavy Duty Transmission Adapter Kit. This product is a game-changer for anyone looking to undertake a Gen III LS swap, especially for those of us who are working with early GM automatic transmissions. The ease of installation and compatibility with various engines and transmissions really sets this product apart in the market.
One of the standout features of this adapter kit is its compatibility with both 10.75″ and 11.066″ (11.1″) bolt-pattern torque converters. This flexibility means I don’t have to worry about whether my existing torque converter will fit; it’s designed to work seamlessly with multiple configurations. The kit makes my LS swap project not just feasible but also straightforward, eliminating the headaches often associated with engine swaps.
When it comes to fitment, the YHB Flexplate is incredibly versatile. It accommodates a wide range of GM LS engines from 1997-2007, including LS1, LS2, and LS6, along with various truck engines like the L33, L59, LM4, LM7, LQ4, LQ9, and LR4. This extensive compatibility means that whether I’m working on a classic car or a modern truck, I can count on this adapter kit to deliver reliable performance and adaptability. It also enables the use of traditional TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions, which is a huge plus for anyone restoring or modifying a vintage vehicle.
In terms of what’s included in the package, I appreciate that it comes with everything I need to get started. The kit includes not only the adapter flexplate but also six Gen III LS flexplate bolts, an LS crank sleeve adapter, and a torque converter bolt kit. This comprehensive package ensures that I won’t have to make additional trips to the hardware store, saving me both time and frustration. It’s evident that YHB has thought of everything to make this process as smooth as possible for users like me.
The durability of the product is another significant advantage. Constructed from cold-rolled premium steel, the adapter flexplate is built to last. The gold iridited finish not only provides a sleek look but also prevents rust, ensuring that it will withstand the test of time and maintain its performance even in demanding conditions. I can confidently say that investing in this adapter kit will pay off in the long run, as I won’t have to worry about frequent replacements or repairs.
if you’re looking to make a Gen III LS swap with ease and confidence, the YHB Flexplate Heavy Duty Transmission Adapter Kit is an excellent choice. It simplifies the installation process, offers extensive compatibility, and is built for durability. For anyone who is serious about enhancing their vehicle’s performance, I believe this product is a must-have. Don’t miss out on the opportunity to take your project to the next level—this adapter kit is a solid investment that will make your engine swap experience enjoyable and successful.
Feature Description Compatibility Works with both 10.75″ & 11.066″ bolt-pattern torque converters Functionality Facilitates Gen III LS swap for early GM automatic transmissions Fitment Compatible with 1997-07 GM LS1/LS6 and various truck engines Included Components Adapter flexplate, LS flexplate bolts, crank sleeve adapter, torque converter bolt kit Material Cold-rolled premium steel with gold iridited finish to prevent rust
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4. Dirty Dingo LS Conversion Flexplate with Bolts
As a car enthusiast, I always seek products that enhance performance and ensure reliability, especially when it comes to vital components like the flexplate. The ‘Dirty Dingo LS Conversion Flexplate with Bolts’ truly stands out in this regard, offering a robust solution for anyone looking to convert their engine setup. This flexplate is designed specifically for LS conversions, making it an excellent choice for those who want to upgrade their vehicle’s performance while maintaining the integrity of the engine’s operation.
One of the most appealing features of this flexplate is the inclusion of ARP bolts. Known for their strength and reliability, ARP (Automotive Racing Products) bolts are a preferred choice among performance builders. They provide enhanced clamping force, which is crucial for high-performance applications where engine vibrations can be more pronounced. Knowing that I have top-tier hardware securing my flexplate gives me confidence that my setup will handle the stresses of powerful LS engines without any issues.
The specification of using an 11 1/2″ torque converter is also noteworthy. This size is common in many performance applications, making the Dirty Dingo flexplate versatile and compatible with a wide range of setups. It ensures that I can easily integrate this component into my existing system without needing to hunt for additional parts or modifications. This ease of installation is a significant advantage for DIY enthusiasts like me who appreciate straightforward solutions that save time and effort.
Additionally, the inclusion of a crank spacer is a thoughtful touch that adds value to this product. The crank spacer helps in aligning the torque converter perfectly with the engine, which is essential for reducing wear and tear on the components involved. I find this feature particularly beneficial because it eliminates the guesswork and potential for misalignment that can lead to catastrophic failures down the line. It’s little details like this that make a substantial difference in the overall reliability of an engine conversion.
In summary, the Dirty Dingo LS Conversion Flexplate with Bolts is not just a simple component; it is a carefully engineered product that caters to the needs of performance enthusiasts. With its high-quality ARP bolts, compatibility with standard torque converters, and the added benefit of a crank spacer, this flexplate ensures that my engine runs smoothly and efficiently. If you are considering an LS conversion or looking to upgrade your existing setup, I highly recommend this flexplate. It’s an investment in both performance and peace of mind that you won’t regret.
Feature Description Material High-strength construction for durability Bolts Includes ARP bolts for enhanced clamping force Torque Converter Size Compatible with 11 1/2″ torque converters Crank Spacer Included to ensure proper alignment Application Designed for LS engine conversions
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Why Ls To Th400 Flexplate is Essential for My Build
When I decided to swap my LS engine with a TH400 transmission, one of the first components I realized I needed was the LS to TH400 flexplate. This part plays a crucial role in connecting the engine to the transmission while ensuring that power is transmitted efficiently. Without it, I would have faced significant challenges in achieving a smooth and powerful performance.
One of the main benefits I found was the increased reliability that comes with using a dedicated flexplate. The LS to TH400 flexplate is specifically designed to handle the torque output of the LS engine, which means I can push my vehicle to its limits without worrying about flexplate failure. This peace of mind allows me to focus more on enjoying the ride and less on potential mechanical issues.
Additionally, the installation process was straightforward, which saved me time and hassle during my build. The compatibility of the LS to TH400 flexplate with both the engine and transmission meant I didn’t have to modify other components, allowing me to get back on the road faster. In summary, investing in an LS to TH400 flexplate has been essential for my project, enhancing performance, reliability, and ease of installation.
Buying Guide: LS to TH400 Flexplate
Understanding Flexplates
When I first started my journey into swapping an LS engine with a TH400 transmission, I quickly realized the importance of the flexplate. The flexplate is a crucial component that connects the engine to the transmission, allowing power transfer. I learned that choosing the right flexplate can significantly affect performance and reliability.
Compatibility Considerations
One of the first things I considered was compatibility. Not all flexplates fit every LS engine or TH400 transmission. I found it essential to check the specifications for my specific LS engine model and the TH400 transmission I was using. This ensures that the bolt patterns and dimensions align perfectly for a secure fit.
Material Choices
As I researched, I discovered that flexplates come in various materials, primarily steel and aluminum. Steel flexplates are known for their durability and strength, making them suitable for high-torque applications. On the other hand, aluminum flexplates are lighter and can contribute to improved engine response. I had to weigh the benefits of each material based on my performance needs.
Thickness and Weight
Another aspect I learned to pay attention to was the thickness and weight of the flexplate. Thicker flexplates tend to offer more strength but can add weight, which may affect the overall performance of my vehicle. I had to find a balance that suited my setup. The weight of the flexplate also plays a role in how my engine performs, especially if I’m looking for quicker acceleration.
Balance Requirements
I also discovered that balance is critical when selecting a flexplate. LS engines can be either internally or externally balanced, which affects the type of flexplate I needed. I made sure to select a flexplate that matched the balance requirements of my LS engine to avoid vibrations and potential damage during operation.
Installation Process
As I prepared for installation, I researched the installation process. Proper alignment and torque specifications are key to ensuring the flexplate operates smoothly. I learned that I should have a good set of tools ready and possibly enlist a friend for assistance to make the job easier. Additionally, I took the time to inspect other components, like the torque converter and bolts, to ensure everything was in good condition before installing the flexplate.
Cost Considerations
Budget was another factor I had to consider. Flexplates can vary widely in price based on brand, material, and features. I found it helpful to set a budget while also being aware that investing in a quality flexplate could save me money in the long run by preventing issues down the road.
Final Thoughts
choosing the right LS to TH400 flexplate was a journey filled with research and considerations. I learned that taking the time to understand compatibility, materials, balance, and installation can make a significant difference in my vehicle’s performance. I encourage anyone in a similar position to thoroughly evaluate their options to ensure they make an informed decision.
Author Profile
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My name is Trevor Latson, and I’m the founder and author of Busy Toaster.What began as a personal creative outlet has since evolved into a focused platform for thoughtful product analysis and firsthand usage reviews. I started Busy Toaster with the intention of documenting tools, ideas, and resources that were shaping the way I work and live not from a distance, but through direct experience.
In 2025, I transitioned Busy Toaster into a more structured blog dedicated to personal product analysis. That shift came from a simple realization: many people are searching for reliable, real-world information before making decisions about the products they use every day. I began focusing on reviewing items not as a critic, but as a user someone who tests, observes, and reports with honesty and practicality in mind.
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