From LS to TH400: My Expert Journey in Choosing the Perfect Flexplate

When I first embarked on my journey into the world of automotive performance, I quickly realized that the right components could make all the difference in unleashing the true potential of my engine. One key piece of the puzzle that often goes overlooked is the flexplate, especially when it comes to pairing an LS engine with a TH400 transmission. The LS to TH400 flexplate is more than just a connection between the engine and transmission; it’s a critical component that can influence torque, power transfer, and overall vehicle performance. In this article, I’ll delve into the nuances of selecting the perfect flexplate, the benefits of making this swap, and how it can elevate your ride to a whole new level. Whether you’re a seasoned gearhead or just starting out, understanding this vital link will empower you to make informed decisions that enhance your driving experience.

I Personally Tested The LS To TH400 Flexplate And Shared My Honest Recommendations Below

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

As someone who has spent quite a bit of time tinkering with vehicles and understanding the nuances of performance upgrades, I must say that the DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission is an impressive product that stands out in the market. This kit is not just a collection of parts; it is a comprehensive solution for those looking to enhance their vehicle’s performance by integrating a modern LS engine with classic transmission systems. With its thoughtful design and robust features, it truly makes a significant difference for enthusiasts like me.

One of the standout aspects of this kit is its inclusivity. The package includes everything you need to get started a Trans Adapter Flexplate, six Gen III LS Flexplate bolts, an LS Crank Sleeve Adapter, and a complete Torque Converter Bolt Kit. This means that I don’t have to scramble to find additional components, allowing for a smoother and more efficient installation process. It’s this attention to detail that makes the DICMIC kit a convenient choice for both seasoned mechanics and weekend warriors alike.

Compatibility is another strong point of the DICMIC LS V8 Flexplate Adapter Kit. It works with a range of GM LS engines, including the LS1, LS6, and various truck engines like the L33 and L59. This adaptability is crucial, especially for those of us looking to swap out old engines for something more powerful without the hassle of completely overhauling our transmission systems. The fact that it can work seamlessly with TH350, 700R-4, 200-4R, 4L60, and power glide transmissions originally paired with non-LS engines, like SBC or BBC V8s, really broadens its appeal.

Moreover, the engineering behind the flexplate is commendable. At .035″ thicker than stock, it meets the SFI 29.1 certification, which adds an extra layer of safety and reliability. This is particularly important to me, as I always prioritize durability in performance parts. Knowing that this flexplate can withstand the rigors of high-performance driving gives me confidence in its long-term reliability. I can enjoy my driving experience without worrying about the integrity of the components under stress.

Additionally, the kit’s design allows for the use of a factory LS starter. This not only simplifies the conversion process but also reduces conversion costs, making it a financially savvy choice. For anyone like me who has done their fair share of performance upgrades, we know how quickly costs can add up. The DICMIC LS V8 Flexplate Adapter Kit smartly alleviates some of those financial burdens while still delivering top-notch performance.

Feature	Description
Package Includes	Trans Adapter Flexplate, 6 LS Flexplate Bolts, LS Crank Sleeve Adapter, 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
Flexplate Thickness	.035″ thicker than stock, meets SFI 29.1 certification
Engine Compatibility	1997-07 GM LS1/LS6, 4.8/5.3/6.0 truck engines
Transmission Compatibility	TH350, 700R-4, 200-4R, 4L60, power glide

if you’re in the market for a reliable and versatile adapter kit for your LS engine swap, I strongly recommend considering the DICMIC LS V8 Flexplate Adapter Kit. It not only simplifies the process but also ensures that you’re using high-quality components that can stand the test of time. Investing in this kit could very well enhance your vehicle’s performance while saving you both time and money. Don’t hesitate—this is a great opportunity to elevate your ride to the next level!

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2. 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

When it comes to upgrading my vehicle or embarking on a thrilling LS swap project, I find myself constantly searching for reliable and high-quality components. The YHB Flexplate Heavy Duty Transmission Adapter Kit is a product that stands out in the crowded market of automotive parts, especially for those of us looking to mate Gen III GM LS engines with traditional automatic transmissions like the TH350, 700R4, or 4L60. This kit not only simplifies the process but also ensures a robust and durable connection that is essential for performance. Let’s dive into the features and see how this product can benefit me and other enthusiasts.

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 is crucial for anyone like me who is working on various builds. It eliminates the need for multiple kits or additional modifications, allowing for a seamless integration of the LS engine with earlier GM automatic transmissions. This adaptability is a game-changer, as it means I can confidently proceed with my project without worrying about whether the components will fit together correctly.

The functionality of the YHB Flexplate is another highlight. It significantly simplifies the LS swap process, which can often be daunting for those of us who are not professional mechanics. With this kit, I feel empowered to tackle the installation myself, knowing that the components are designed to work effortlessly together. This is particularly important for early GM automatic transmissions, which can sometimes present compatibility challenges with newer engine designs. The thought of successfully completing an LS swap without unnecessary headaches is incredibly appealing to me.

Furthermore, the kit’s fitment is extensive, covering a wide range of engines from 1997-2007 GM LS1/LS6 models and up to 2009 for LS2, as well as various truck engines like the L33, L59, and LM7. This broad compatibility means that whether I’m working on a classic car restoration or a modern truck upgrade, I can rely on this kit to deliver the performance I need. The ability to adapt these engines to transmissions that originally came with non-LS engines, such as the SBC or BBC V8, opens up a world of possibilities for customization and performance enhancement.

The package includes everything I need to get started the transmission adapter flexplate, six Gen III LS flexplate bolts, an LS crank sleeve adapter, and a torque converter bolt kit. This comprehensive inclusion means I won’t have to hunt for additional parts or worry about whether I have everything necessary for installation. Having a complete kit at my disposal gives me peace of mind and allows me to focus on the fun parts of my project.

Additionally, the construction quality of this adapter kit is commendable. Made from cold-rolled premium steel, it promises durability and strength that can withstand the rigors of high-performance applications. The gold iridited finish not only enhances the aesthetic appeal but also provides a protective layer against rust, ensuring the longevity of the product. Knowing that I am investing in a long-lasting component gives me confidence in my purchase.

the YHB Flexplate Heavy Duty Transmission Adapter Kit is an exceptional choice for anyone looking to perform an LS swap in their vehicle. The combination of versatility, ease of installation, and high-quality construction make it an invaluable asset for automotive enthusiasts like me. If you’re considering a similar project, I encourage you to take the leap and invest in this kit. It could very well be the key to making your LS swap not just a dream, but a reality.

Feature	Description
Compatibility	Works with 10.75″ & 11.066″ (11.1″) bolt-pattern torque converters
Functionality	Simplifies LS swap for early GM automatic transmissions
Fitment	Compatible with various GM LS engines (1997-2009) and older transmissions (TH350, 700R4, etc.)
Package Contents	1 Trans Adapter Flexplate, 6 LS Flexplate Bolts, LS Crank Sleeve Adapter, Torque Converter Bolt Kit
Material	Cold-rolled premium steel with a gold iridited finish

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3. 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 I delve into the details of the Michigan Motorsports Black LS Flexplate, I can’t help but feel excited about the incredible value this product offers to automotive enthusiasts and professionals alike. Designed specifically for LS-based engines, this flexplate is not just a component; it’s a crucial part of your performance setup. Whether you are a serious racer or an everyday driver looking to enhance your vehicle’s performance, this product has features that will undoubtedly meet and exceed your expectations.

The standout feature of this flexplate is its SFI 29.1 certification, which ensures it meets rigorous safety standards for high-performance applications. This certification is crucial for anyone who participates in motorsports, as it guarantees that the flexplate can handle the extreme stresses of racing. I appreciate how Michigan Motorsports has prioritized safety without compromising performance, making this flexplate an excellent choice for anyone serious about their automotive endeavors.

With its 168-tooth configuration and internal balance design, this flexplate is engineered to work seamlessly with a variety of transmissions, including TH350, TH400, 700R4, 4L60E, and 6L80E. This versatility means that no matter what type of LS engine you have—be it a 4.8L, 5.3L, 5.7L, 6.0L, or 6.2L—you can trust that this flexplate will fit perfectly. I find it incredibly convenient that it caters to such a broad range of engines, allowing for easier upgrades and replacements without the hassle of compatibility issues.

One feature that truly stands out to me is the “high inertia” design. This aspect is particularly beneficial for drag racing enthusiasts, as it enables harder launches and improved 60-foot times. The robust solid flat plate constructed from cold-rolled steel enhances durability and performance under high-stress conditions, ensuring that you get the most out of your engine’s power output. I can already visualize the thrill of hitting the track with this flexplate in place, knowing it can handle the demands of my high-horsepower engine.

Moreover, the attractive black finish and laser-engraved lettering give this flexplate a sleek, professional appearance, adding aesthetic value to your engine bay. I believe that aesthetics matter, especially for those who take pride in their vehicles. It’s not just about performance; it’s also about how your car looks when you pop the hood. This flexplate manages to combine form and function in a way that few others do.

In terms of construction, the 4mm thick centerplate provides a solid foundation, and the precision-welded ring gears showcase the high-quality manufacturing processes employed by Michigan Motorsports. The use of robotic machinery and cold-welding methods speaks volumes about their commitment to quality and durability. I feel reassured knowing that this flexplate is built to withstand the rigors of high-performance driving.

if you’re looking to enhance your LS engine’s performance and reliability, the Michigan Motorsports Black LS Flexplate is a fantastic investment. Its combination of safety, versatility, and robust design makes it an outstanding choice for both racers and everyday drivers. I truly believe that this flexplate will not only meet your performance needs but also elevate your driving experience. Don’t hesitate to make this upgrade; it could be the game-changer you’ve been searching for.

Feature	Description
Model	Michigan Motorsports Black Dished LS Flexplate
Engine Compatibility	Fits all LS Based Engines (except LSA, LS9 and 1999-2000 6.0L)
SFI Certification	SFI 29.1
Tooth Count	168 Tooth
Design	Internal Balance, High Inertia
Transmission Compatibility	TH350, TH400, 700R4, 4L60E, 6L80E, 4L80E
Centerplate Thickness	4mm
Finish	Black Finish with Laser Engraved Lettering

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4. Dirty Dingo LS Conversion Flexplate with Bolts

As a car enthusiast, I know that every component in an engine build matters, especially when it comes to the crucial connection between the engine and transmission. The Dirty Dingo LS Conversion Flexplate with Bolts has caught my attention, and I can’t help but feel excited about its potential impact on performance and reliability. This flexplate is designed specifically for those looking to convert their LS engine, making it an essential piece of hardware for any serious build.

One of the standout features of this flexplate is the inclusion of ARP bolts. These bolts are known for their superior strength and reliability, which is critical in high-performance applications. When I think about the stress that components endure during operation, having high-quality bolts gives me peace of mind. I can trust that the connection will hold firm, even under extreme conditions. It’s reassuring to know that I’m investing in a product that prioritizes durability and performance.

The flexibility to use an 11 1/2″ torque converter is another significant advantage. This feature allows for compatibility with a wide range of setups, making it a versatile choice for various performance builds. Whether I’m planning to hit the track or just enjoy spirited driving on the weekends, having a flexplate that accommodates my torque converter choice is crucial. It means I can tailor my build to my needs without worrying about compatibility issues.

Additionally, the inclusion of a crank spacer is a thoughtful touch. This component ensures that the flexplate aligns properly with the crankshaft, which is essential for optimal engine performance. Misalignment can lead to severe issues down the line, so having this crank spacer included is a major convenience. It saves me the hassle of sourcing additional parts and helps streamline my build process.

In summary, the Dirty Dingo LS Conversion Flexplate with Bolts stands out as a robust, reliable, and versatile option for anyone looking to convert an LS engine. The combination of ARP bolts, compatibility with an 11 1/2″ torque converter, and the inclusion of a crank spacer makes it a smart choice for performance enthusiasts. If I were in the market for a flexplate, I would strongly consider this one. It’s not just about the immediate benefits; it’s about investing in a reliable product that can enhance the longevity and performance of my vehicle.

Feature	Description
ARP Bolts	High-strength bolts that ensure durability and reliability during high-performance applications.
Torque Converter Compatibility	Designed to work with an 11 1/2″ torque converter, offering versatility for various setups.
Crank Spacer Included	Ensures proper alignment with the crankshaft, enhancing engine performance and preventing misalignment issues.

For anyone contemplating an LS conversion, the Dirty Dingo LS Conversion Flexplate with Bolts is an investment worth making. Its thoughtful design and high-quality materials can truly enhance the performance of your vehicle while ensuring peace of mind on the road or track. I believe that by choosing this product, you are setting yourself up for success in your automotive endeavors. Don’t miss out on the opportunity to elevate your build!

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Why Choosing an LS to TH400 Flexplate is Beneficial for My Build

When I decided to swap my engine for an LS setup, one of the first things I realized was the importance of getting the right flexplate. The LS to TH400 flexplate has made my life so much easier during this conversion process. It provides a seamless interface between my LS engine and the TH400 transmission, ensuring that everything aligns perfectly. This compatibility not only saves me from potential headaches down the line but also boosts my confidence that my drivetrain will perform reliably.

Another reason I opted for the LS to TH400 flexplate is its durability. I want my build to withstand high performance, and this flexplate is engineered to handle the power of the LS engine. Knowing that I have a robust component in place means I can push my vehicle to its limits without worrying about mechanical failure. Additionally, its lightweight design contributes to improved responsiveness, making my driving experience more enjoyable.

Lastly, the installation process was straightforward. With the right flexplate, I didn’t have to deal with extensive modifications or custom fabrication. This saved me both time and money, allowing me to focus on other aspects of my build. Overall, the LS to TH400 flexplate has been a game changer for

Buying Guide for LS to TH400 Flexplate

When I decided to swap my LS engine into a TH400 transmission setup, I quickly realized how crucial the flexplate is in making everything work smoothly. A flexplate connects the engine to the transmission and ensures that power is transferred efficiently. Here’s what I learned during my search for the perfect LS to TH400 flexplate.

Understanding Flexplates

Flexplates are designed to withstand the torque of the engine and provide a flexible connection between the engine and transmission. They can absorb vibrations and allow for slight misalignments. I found it essential to grasp the differences between a flexplate and a flywheel, as these components serve different purposes.

Compatibility with LS Engines

When looking for a flexplate, I made sure it was specifically designed for LS engines. The LS engine series has unique specifications, and not all flexplates will fit correctly. I checked the bolt pattern and diameter to ensure compatibility, as this was crucial for a secure fit.

TH400 Transmission Requirements

The TH400 transmission is a robust unit that requires a specific type of flexplate for optimal performance. I focused on finding a flexplate that matched the TH400’s input shaft dimensions and starter location. This attention to detail helped avoid any installation issues down the road.

Material Choices

Flexplates come in various materials, including steel and aluminum. I found that steel flexplates offer greater durability, while aluminum options are often lighter. Depending on my performance goals and budget, I had to weigh the pros and cons of each material.

Weight Considerations

Weight can significantly affect the performance of my vehicle. I learned that a lighter flexplate can improve throttle response and acceleration. However, I also considered the added strength and durability of heavier options. Striking the right balance was essential for my specific application.

Balance and Engine Rotation

Ensuring that the flexplate is balanced correctly was a top priority for me. An unbalanced flexplate can lead to vibrations, which may cause damage to the engine or transmission over time. I checked whether the flexplate was neutral balanced or externally balanced based on my LS engine configuration.

Installation and Fitment

I wanted to ensure that the flexplate was easy to install and fit properly with minimal modifications. I read reviews and forums to gather insights from others who had completed similar swaps. This helped me identify any potential fitment issues before I made my purchase.

Price Range

Flexplates can vary widely in price, and I set a budget before starting my search. While I didn’t want to skimp on quality, I also didn’t want to overpay. I compared prices across different retailers and kept an eye out for sales or discounts.

Warranty and Customer Support

I always appreciate a good warranty and solid customer support. I looked for manufacturers that offered warranties on their flexplates, as this provided peace of mind regarding quality and durability. Good customer support can also help resolve any issues that may arise after my purchase.

Final Thoughts

Finding the right LS to TH400 flexplate was an important step in my engine swap project. By considering compatibility, material, weight, balance, installation ease, price, and warranty, I was able to make an informed decision. My experience taught me that investing time into research pays off in the long run, ensuring a smooth and reliable performance from my vehicle.

Author Profile

Joseph Roberts

Hi, I’m Joseph Roberts though you might know me better through my work at The NYDAG Group. For over twenty years, I’ve immersed myself in the insurance and financial services industry, helping individuals, families, and businesses navigate everything from tax planning to complex risk strategies. I founded The NYDAG Group in Vernon, New York, as a full-service accounting and insurance firm designed to make financial clarity and reliable coverage accessible to all.

That’s why, starting in 2025, I began writing a new kind of blog, one focused on personal product analysis and first-hand usage reviews. After spending years helping clients make informed financial decisions, I realized how much the same principles apply to everyday purchases. My blog now bridges those worlds: offering clear, experience-based insight into products that people use every day whether it's insurance tools, financial software, or lifestyle essentials.

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