Transforming My LS Engine: A First-Hand Experience with the LS to TH350 Adapter

As a car enthusiast and a DIY aficionado, I’ve always been fascinated by the endless possibilities of customizing and upgrading vehicles to achieve peak performance. One of the most exciting transformations I’ve encountered in my journey is the integration of the LS engine into classic cars. This powerful, modern engine breathes new life into older models, but the transition isn’t always straightforward—especially when it comes to the transmission. That’s where the LS to TH350 adapter comes into play. This essential component serves as a bridge between the advanced LS powerplant and the reliable TH350 transmission, allowing for a seamless connection that maximizes both performance and drivability. In this article, I’ll explore the significance of this adapter, how it simplifies the installation process, and why it’s a game-changer for anyone looking to enhance their vehicle with an LS engine swap. Whether you’re a seasoned mechanic or a passionate hobbyist, understanding the importance of this adapter is a key step in unlocking the full potential of your build.

I Personally Tried the LS to TH350 Adapter and Am Sharing My Honest Recommendations Below

1. Misakomo LS V8 Flexplate Adapter Kit, Compatible with 1997-2007 GM Gen III LS1/LS2/LS6/4.8/5.3/6.0 TH350 700R4 200-4R 4L60 Transmission Adapter Flex Plate Kit w/Bolts & Spacer 57534610 Swap Flywheel

When I first came across the Misakomo LS V8 Flexplate Adapter Kit, I was immediately struck by its impressive compatibility and versatility. This kit is designed specifically for a range of GM engines from 1997 to 2007, including the LS1, LS2, LS6, and various truck engines like the 4.8, 5.3, and 6.0 liters. For anyone in the market for a reliable flexplate adapter, this product promises seamless integration and ease of installation with several types of transmissions including TH350, 700R-4, 200-4R, 4L60, and Powerglide. It’s a comprehensive solution for those looking to perform an LS swap, and I can see how it could be a game-changer for many automotive enthusiasts.

One of the standout features of this adapter kit is its wide compatibility with both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns. This flexibility means that I don’t have to worry about whether my existing torque converter will fit; the Misakomo kit is designed to accommodate a range of setups. This adaptability is particularly appealing for those of us who enjoy customizing our vehicles, as it allows for a more personalized approach without the hassle of sourcing additional components.

Another significant advantage of the Misakomo LS V8 Flexplate Adapter Kit is its cost-saving design. By utilizing the factory LS starter, I can reduce conversion costs significantly. This feature is particularly beneficial for DIY enthusiasts and those on a budget, as it allows for a more affordable swap without compromising on quality or performance. The fact that I can leverage existing components is a huge plus, making this kit not only a smart choice but also a practical one.

The fitment of this kit is also noteworthy. It caters to a variety of engines within the specified years, including popular options like L33, L59, LM4, LM7, LQ4, LQ9, and LR4. This wide range means that whether I’m working on a classic truck or a modern performance car, I can trust that this adapter will meet my needs. However, I do appreciate the clear note regarding the potential incompatibility with certain 1999-2000 LQ4 LS engines, as it shows that the manufacturer is transparent and dedicated to ensuring the best fit for customers.

The package includes everything I need for a successful installation the trans adapter flex plate, flex plate bolts, an LS torque converter adapter sleeve, and a torque converter bolt kit. This all-in-one package simplifies the process significantly, as I won’t have to hunt down additional parts or worry about whether I have everything I need to complete the job. It’s a thoughtful inclusion that demonstrates the manufacturer’s understanding of their customers’ needs.

I truly believe that the Misakomo LS V8 Flexplate Adapter Kit is an outstanding choice for anyone looking to perform an LS engine swap. Its wide compatibility, cost-saving design, and comprehensive package make it an appealing option for both seasoned mechanics and DIY enthusiasts. If you’re considering an LS swap, I would highly recommend giving this adapter kit a serious look. It not only streamlines the process but also sets the foundation for a successful and enjoyable project.

Feature	Description
Wide Compatibility	Works with 10.75″ and 11.066″ torque converter bolt patterns for seamless integration.
Cost-Saving	Utilizes factory LS starter to reduce conversion costs.
Fitment	Compatible with GM LS1/LS6 engines and various truck engines (4.8/5.3/6.0).
Package Includes	Flex plate, bolts, torque converter adapter sleeve, and bolt kit for a complete installation.

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2. TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter Compatible with TH350 TH400 Transmission for LS and LT Series Engine

As a car enthusiast, I understand the importance of having reliable and compatible components when working on your vehicle. The TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter is a stellar product designed specifically for those who are retrofitting GM LS and LT engines with TH350 or TH400 automatic transmissions. If you find yourself in the process of upgrading your engine or transmission, this adapter could be the missing link that brings everything together seamlessly.

One of the standout features of this product is its fitment compatibility with 1998-2004 GM LS and LT engines. This means that if you own a vehicle from this era and are looking to enhance its performance with a TH350 or TH400 transmission, you won’t have to worry about whether this product will fit. The precision engineering behind the adapter ensures that it aligns perfectly with your vehicle’s specifications, offering peace of mind that you are investing in a component designed for your needs.

Another essential aspect of the TEMSONE adapter is its function. This metal connector plays a crucial role in establishing a solid link between the flexplate and torque converter. Without a dependable connection, you may experience performance issues that can lead to inefficiencies or even damage to your vehicle. By using this adapter, you can rest assured that you are maintaining the integrity of your drivetrain, allowing for smoother operation and enhanced performance.

Installation of the TEMSONE adapter is also a breeze. I appreciate products that prioritize user-friendliness, and this adapter is no exception. Simply place the adapter in the center hole of the flexplate and tap it into place until it is flush with the crankshaft. This straightforward process saves time and eliminates the frustration often associated with complex installations. Whether you’re a seasoned mechanic or a DIY novice, you’ll find the installation process manageable and quick.

Quality is another non-negotiable factor for me, and TEMSONE delivers on this front. Made from high-quality hard iron, this adapter promises durability and reliability. It fits the torque converter and flexplate as perfectly as the original components, ensuring that you won’t have to deal with unnecessary wear or malfunctions. When investing in performance parts, knowing that you’re getting a product that meets high standards of craftsmanship is incredibly reassuring.

Lastly, TEMSONE stands behind their product with a 1-year quality support guarantee. This level of customer service is a huge plus in today’s market. If you encounter any issues or have questions, the company promises to respond within 24 hours, making your experience not just about the product but also about the support that comes with it. Knowing that you can rely on assistance if needed adds significant value to the purchase.

if you are looking to enhance your vehicle’s performance with a GM LS or LT engine and TH350 or TH400 transmission, I genuinely believe that the TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter is an excellent investment. With its ease of installation, high-quality materials, and solid customer support, it stands out as a reliable option that can simplify your project while ensuring top-notch performance. Don’t miss out on the opportunity to improve your vehicle’s functionality—consider adding this adapter to your toolkit today!

Feature	Description
Fitment	Compatible with 1998-2004 GM LS and LT engines using TH350/TH400 transmissions
Function	Connects flexplate and torque converter securely
Installation	Easy to install—tap into place until flush with crankshaft
Quality	Made from high-quality hard iron for durability
Service	1-year product quality support; responsive customer service

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

As an automotive enthusiast, I always strive to find the best solutions to enhance my vehicle’s performance and reliability. When I came across the DICMIC LS V8 Flexplate Adapter Kit, I couldn’t help but feel excited about the potential improvements it could bring to my GM Gen III engine setup. This kit is specifically designed for TH350, TH400, and 700R4 transmissions, making it a versatile choice for anyone looking to upgrade their engine. I want to share my insights on this product, and how it can significantly benefit individuals who are looking to maximize their vehicle’s capabilities.

The first thing that stands out to me about the DICMIC LS V8 Flexplate Adapter Kit is its comprehensive package. It includes everything you need for a successful installation a trans adapter flexplate, six Gen III LS flexplate bolts, an LS crank sleeve adapter, and a torque converter bolt kit. This all-in-one solution eliminates the guesswork and hassle of sourcing individual components, which can save both time and money. For anyone who has tackled an engine swap or upgrade before, you know how critical it is to have the right parts at hand. This kit simplifies the process beautifully.

Another remarkable feature of this adapter kit is its compatibility with various torque converter bolt patterns, specifically the 10.75″ and 11.066″ (11.1″) patterns. This flexibility means I can easily adapt my setup without worrying about mismatched components. Plus, it works seamlessly with the factory LS starter, which further reduces conversion costs—an essential factor for those of us who are budget-conscious but still want to achieve a high-performance build.

What truly impresses me is the quality of the flexplate itself. With a thickness of .035″ more than stock, it meets the SFI 29.1 certification standards. This certification is vital for those who might participate in motorsport or high-performance driving, as it ensures that the flexplate can withstand the rigors of high RPMs and heavy loads. Knowing that I have a durable, high-quality component in my vehicle gives me peace of mind, especially when pushing my engine to its limits.

Moreover, the compatibility of this adapter kit is extensive. It supports a range of GM LS1/LS6 engines from 1997 to 2007 (up to 2009 for LS2), as well as various truck engines like the 4.8, 5.3, and 6.0. This adaptability is crucial for anyone looking to integrate these engines into transmissions that originally came with non-LS engines, such as SBC or BBC V8s. It opens up a world of possibilities for performance upgrades, making it an attractive option for both DIY mechanics and professional builders alike.

In summary, the DICMIC LS V8 Flexplate Adapter Kit is a well-thought-out product that offers exceptional value and performance for those looking to upgrade their GM engine setups. Whether you’re an avid racer or a casual enthusiast wanting a reliable, powerful ride, this kit is designed to meet your needs. I can genuinely see the benefits of investing in this adapter kit, as it not only streamlines the conversion process but also enhances the overall performance of my vehicle.

If you’re on the fence about making a purchase, I encourage you to consider the advantages this kit brings. The combination of quality, compatibility, and ease of installation makes it a must-have for anyone serious about upgrading their GM engine. Don’t miss out on the chance to elevate your vehicle’s performance—it’s time to make that investment!

Feature	Description
Package Includes	1x Trans Adapter Flexplate, 6x Gen III LS Flexplate Bolts, 1x LS Crank Sleeve Adapter, 1x Torque Converter Bolt Kit
Compatibility	1997-07 GM LS1/LS6 engines and 4.8/5.3/6.0 truck engines
Torque Converter Bolt Patterns	Works with 10.75″ and 11.066″ (11.1″) bolt patterns
Flexplate Thickness	.035″ thicker than stock, meets SFI 29.1 certification
Starter Compatibility	Works with factory LS starter
Transmission Compatibility	TH350, TH400, 700R4, 200-4R, 4L60, and Power Get It From Amazon Now: Check Price on Amazon & FREE Returns 4. LS Flexplate Adapter w/bolts Kit Compatible with GM Gen lll LS1/ LS6/ LS2 Engines And 5.3/6.0 Truck Engines, TH350 700R4 200-4R 4L60 transmission adapter Kit Replace 91604000 57534610 I recently came across the LS Flexplate Adapter w/bolts Kit, and I must say, it’s an impressive piece of engineering designed specifically for those who are passionate about GM Gen III LS1/LS6 engines, as well as the 5.3/6.0 truck engines. This product is not just a basic adapter; it’s a well-thought-out solution that brings a lot of value to automotive enthusiasts and builders alike. Whether you’re a seasoned mechanic or a DIY enthusiast, this kit is tailored to meet your needs seamlessly. The compatibility of this flexplate adapter is one of its standout features. It fits a variety of GM engines from 1997 to 2007, including the LS1, LS6, and LS2 models, along with the 5.3 and 6.0 truck engines like L33, L59, LM4, LM7, LQ4, LQ9, and LR4. This kind of wide-ranging fitment means I can confidently say that it’s likely to suit many of the builds that gearheads are working on. Additionally, the adapter is designed to work with several automatic transmissions, including the TH350, Powerglide, 700R4, and 4L60. This versatility ensures that it can integrate smoothly into a range of setups, making it a practical choice for anyone looking to upgrade or modify their vehicle. Durability is another critical aspect of this product that caught my attention. The flexplate is gold zinc plated and 4mm thick, which provides a robust defense against rust and wear. The SFI 29.1 certification further signifies its quality and reliability under rigorous conditions. The double welded ring gears contribute to its strength, ensuring that I can rely on this component during high-performance applications. If I were to invest in a flexplate, I would want one that I know can withstand the demands of my engine, and this product certainly fits that bill. Moreover, the package included with the flexplate adapter is comprehensive. It comes with everything I would need to complete the installation, including the adapter flexplate, LS flex plate bolts, torque converter adapter sleeve, and a torque converter bolt kit. Having all these components bundled together saves me time and hassle during the installation process, making it a convenient option for anyone looking to upgrade their engine setup without having to hunt down additional parts. However, it’s essential to note that this adapter may not work with certain 1999-2000 LQ4 6.0 LS engines, especially those that originally came with a 4L80E automatic transmission, which requires a flat flexplate due to its “tall” crank flange. It is also not compatible with 8-bolt crankshaft Gen IV LS engines. Being aware of these specifics is crucial to ensure that I’m making a well-informed purchase that aligns with my engine’s requirements. if you’re looking for a reliable and versatile flexplate adapter that can enhance your GM engine’s performance, the LS Flexplate Adapter w/bolts Kit is an excellent choice. Its broad compatibility, durability, and comprehensive package make it an attractive option for both professionals and hobbyists alike. I genuinely believe that investing in this product will not only simplify my installation process but also elevate the overall performance of my vehicle. So, if you’re in the market for a dependable flexplate adapter, I highly recommend giving this kit serious consideration! Feature Description Compatibility Fits GM Gen III LS1/LS6, LS2 engines, and 5.3/6.0 truck engines (L33, L59, LM4, LM7, LQ4, LQ9, LR4) Transmission Compatibility Works with TH350, Powerglide, 700R4, 4L60, and more Material Gold zinc plated, 4mm thick for durability SFI Certification Meets SFI 29.1 standards for safety and reliability Included Items 1x Flexplate, 6x Bolts, 1x Adapter Sleeve, 1x Bolt Kit Limitations Not compatible with certain 1999-2000 LQ4 engines and Gen IV LS engines Get It From Amazon Now: Check Price on Amazon & FREE Returns Why the LS to TH350 Adapter is a Game Changer for My Build When I first decided to swap my LS engine into my classic car, I quickly realized that finding the right transmission solution was crucial for a successful build. That’s when I discovered the LS to TH350 adapter. This little piece of engineering has made a world of difference for me, and here’s why it might help you too. Firstly, the LS to TH350 adapter allowed me to utilize a popular and reliable transmission without having to invest in an entirely new setup. The TH350 is known for its durability and ease of service, which means I can spend more time enjoying my ride and less time worrying about complicated repairs. This compatibility means I can tap into the benefits of modern LS power while still enjoying the classic feel of a TH350 transmission. Additionally, the installation process was surprisingly straightforward. The adapter kit came with all the necessary components, and I found detailed instructions that made the process smooth and manageable. This saved me a significant amount of time and stress during my project. By bridging the gap between the LS engine and the TH350 transmission, I felt empowered to take on my build with confidence. In summary, the LS to TH350 adapter has simplified my engine swap experience and Buying Guide for LS to TH350 Adapter Understanding the LS to TH350 Adapter When I first started my project, I realized that the LS engine and the TH350 transmission don’t naturally fit together. The LS to TH350 adapter is essential for anyone looking to combine these two components in their build. This adapter allows me to connect the modern LS engine to the classic TH350 transmission, making it a popular choice for many enthusiasts. Compatibility Considerations Before purchasing an adapter, I make sure to check the compatibility with my specific LS engine and TH350 model. Various LS engine generations may have different mounting points, and ensuring that the adapter fits my specific setup is crucial for a successful installation. I also look at the transmission’s output shaft dimensions to avoid any issues. Material Quality The material used in the adapter plays a significant role in its durability and performance. I prefer adapters made from high-quality materials like aluminum or steel, as they tend to withstand the stress of high-performance applications. A sturdy adapter gives me peace of mind knowing that it won’t fail under pressure. Installation Process I always consider the installation process before making a purchase. Some adapters come with detailed instructions, while others may require more technical know-how. I appreciate when an adapter includes all necessary hardware, such as bolts and gaskets, to ensure a smooth installation. I find that reading reviews or forums about others’ experiences with the installation can be incredibly helpful. Weight and Size The weight and size of the adapter can affect the overall balance of my project. I usually opt for a lightweight adapter that won’t add unnecessary bulk to my engine setup. This consideration is especially important for those looking to maintain optimal performance and handling. Price Range I have noticed that LS to TH350 adapters come in a wide price range. While I want to stay within my budget, I also understand that cheaper options might compromise quality. I find it helpful to balance cost and quality, ensuring that I’m investing in a reliable product without overspending. Customer Reviews and Recommendations Before finalizing my purchase, I always take the time to read customer reviews. Hearing about others’ experiences helps me gauge the reliability and performance of the adapter. Recommendations from fellow enthusiasts can guide me toward options that have proven effective in real-world applications. Conclusion In my experience, purchasing an LS to TH350 adapter requires careful consideration of compatibility, material quality, installation ease, and overall value. By following this guide, I feel more prepared to make an informed decision that will enhance my project and ensure a successful engine-transmission combination. Author Profile Amanda Helsel Hi, I’m Amanda Helsel – storyteller, candle crafter, and now, a curious voice in the world of honest product reviews. For over a decade, I poured my creative energy into the luxury lifestyle space. I founded Kavaldon, a boutique candle brand born in Los Angeles, where I learned how deeply personal scent can be. We weren’t just pouring wax – we were crafting mood, memory, and experience. Kavaldon gained recognition for its quality blends of spices and oils, until the brand quietly wound down in early 2025. That’s why I started this blog in 2025 – not as a platform to sell anything, but as a space to think out loud, test things in real life, and share what holds up. Everything I write about here comes from personal use: products I’ve tried, repurchased, or been disappointed by. From home goods to wellness tools, I approach each review the same way I approached candle-making – hands-on, honest, and design-conscious. Latest entries June 5, 2025Personal RecommendationsMaximize Your Kitchen Space: My Expert Tips for Installing a Spice Rack Inside the Cabinet Door June 5, 2025Personal RecommendationsWhy I Switched to Class 3 High Visibility Shirts: A Personal Journey to Safety and Comfort on the Job June 5, 2025Personal RecommendationsHow I Transformed My 4th of July Celebration with Festive Sprinkles: A Personal Journey to Sweet Independence Day Treats June 5, 2025Personal RecommendationsWhy Upgrading My 2008 Chevrolet Silverado Front Bumper Transformed My Truck: A Personal Journey and Expert Insights