Unlocking Performance: My First-Hand Experience with the LS to TH350 Adapter

When I first embarked on my journey into the world of automotive customization, I quickly realized that the right components can make all the difference in performance and drivability. One topic that piqued my interest was the Ls to Th350 adapter—a vital piece that bridges the gap between modern LS engines and the classic TH350 transmission. As I delved deeper, I discovered that this adapter not only enhances compatibility but also opens up a world of possibilities for enthusiasts looking to upgrade their rides with cutting-edge technology while maintaining that nostalgic feel. In this article, I’m excited to share my insights on why this adapter is a game-changer for gearheads and how it can transform your vehicle’s performance and aesthetics. Join me as we explore the fascinating intersection of innovation and tradition in the realm of automotive engineering!

I Personally Tried The LS To TH350 Adapter And Here Are My Honest Recommendations

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

As an automotive enthusiast, I am always on the lookout for products that enhance performance and reliability, particularly when it comes to engine components. The TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter is a standout solution for those of us working with GM LS and LT engines paired with TH350 or TH400 transmissions. This adapter not only promises to streamline installation but also ensures that the critical connection between the flexplate and torque converter is secure and efficient.

One of the most appealing aspects of this product is its compatibility. Designed specifically for the 1998-2004 GM LS and LT engines, I find it reassuring that the adapter is tailored to fit these popular engine types seamlessly. This means that I can trust that it will work effectively without any complicated modifications, saving both time and effort during installation. The thought of a straightforward fit makes my engine swap or upgrade project feel much more manageable.

Installation is often a significant concern for many DIY mechanics, and the TEMSONE adapter excels in this regard. The instructions are simple just place the adapter in the center hole of the flexplate and tap it into place until it’s flush with the crankshaft. This ease of installation is a game changer, especially when dealing with heavy components like torque converters. It alleviates the frustration often associated with complex setups and gives me the confidence to tackle the project myself.

Quality is another critical factor I consider when purchasing automotive components, and TEMSONE does not disappoint. Made from high-quality hard iron, this adapter is designed to replicate the original fit and function of the torque converter and flexplate connection. The durability and sturdiness of this material ensure that I won’t have to worry about premature wear or failure, which is a common concern with lower-quality alternatives. Knowing that I am investing in a reliable product allows me to focus on performance improvements rather than potential issues down the road.

Furthermore, the customer service aspect is noteworthy. TEMSONE offers a one-year product quality support guarantee, which reflects their commitment to customer satisfaction. If I encounter any issues or have questions during installation or use, I can reach out to them and expect a response within 24 hours. This level of support is invaluable, especially for someone like me who may need assistance navigating new products.

Feature	Details
Fitment	Compatible with 1998-2004 GM LS and LT engines using TH350 / TH400 transmission
Function	Metal connector for flexplate and torque converter
Installation	Easy to install by tapping into place
Quality	High-quality hard iron construction for durability
Service	1-year product quality support with responsive customer service

if you are considering an upgrade or a swap involving a GM LS or LT engine, the TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter is a product worth investing in. Its thoughtful design, ease of installation, and robust quality make it an excellent choice for anyone looking to enhance their automotive project. I genuinely believe that this adapter will not only meet but exceed your expectations, providing both peace of mind and improved performance. Don’t hesitate to make this addition to your toolkit; it could very well be the missing link in your engine setup.

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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 or swapping out engines in classic cars, the right components can make all the difference in ensuring a seamless and efficient transition. I recently came across the YHB Flexplate Heavy Duty Transmission Adapter Kit, specifically designed for Gen III GM LS1, LS2, and LS6 engines (5.3/6.0) to TH350, 700R4, and 4L60 transmissions from 1997 to present. This product offers an excellent solution for those looking to enhance their vehicle’s performance while maintaining compatibility with older transmission systems.

One of the standout features of this adapter kit is its versatility. The flexplate works seamlessly with both 10.75″ and 11.066″ (11.1″) bolt-pattern torque converters, which opens up a world of possibilities for engine swaps. For car enthusiasts like me who enjoy tinkering with different setups, having a product that accommodates various torque converters is a massive plus. This flexibility allows me to customize my vehicle’s powertrain without the need to completely overhaul my setup, making it an attractive option for anyone looking to upgrade their classic car.

Another significant advantage of the YHB Flexplate Kit is its user-friendly installation. This transmission adapter kit simplifies the process of integrating a Gen III LS engine into early GM automatic transmissions. I can confidently say that for anyone attempting an LS swap, this kit will make the entire process much smoother and less time-consuming. The ease of installation is a game-changer, especially for those of us who may not have extensive mechanical experience but are eager to take on such projects.

Fitment is critical when it comes to performance parts, and this kit does not disappoint. It is designed to work with a broad range of GM LS engines, including the 1997-2007 LS1 and LS6 engines, as well as the 4.8, 5.3, and 6.0 truck engines. This means that if you’re working on an engine swap involving L33, L59, LM4, LM7, LQ4, LQ9, or LR4, you can rest assured that this adapter will fit perfectly with TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions. Knowing I can adapt my engine to a variety of transmissions gives me peace of mind and confidence in the product’s versatility.

The package includes everything needed for installation one transmission adapter flexplate, six Gen III LS flexplate bolts, one LS crank sleeve adapter, and one torque converter bolt kit. Having all these components included not only saves me time and hassle in sourcing individual parts but also ensures that I have everything I need to get the job done right the first time. It’s a thoughtful touch that makes this kit appealing for both seasoned mechanics and DIY enthusiasts alike.

Durability is always a concern when it comes to performance parts, and the YHB Flexplate does not skimp on this aspect. Constructed from cold-rolled premium steel, it boasts a long-lasting gold iridited finish that effectively prevents rust. As someone who appreciates quality and longevity in automotive components, I find this feature particularly reassuring. It means that I can rely on this flexplate to withstand the rigors of performance driving without fear of degradation over time.

In summary, the YHB Flexplate Heavy Duty Transmission Adapter Kit is an excellent investment for anyone looking to perform an LS swap with confidence and ease. With its impressive range of features, user-friendly installation process, broad fitment options, comprehensive package, and durable construction, this kit stands out in the market. If you’re considering an engine upgrade or swap, I highly recommend giving this product serious thought. It could very well be the key to unlocking the full potential of your vehicle.

Feature	Description
Compatibility	Works with 10.75″ & 11.066″ bolt-pattern torque converters
Installation	Simplifies LS swaps for early GM automatic transmissions
Fitment	Fits 1997-2007 GM LS1/LS6 and various truck engines
Package Includes	Adapter flexplate, bolts, crank sleeve adapter, torque converter bolt kit
Material	Cold-rolled premium steel with rust-resistant finish

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

As someone who has always been passionate about automotive performance and modifications, I find the DICMIC LS V8 Flexplate Adapter Kit to be a remarkable product for those looking to upgrade or modify their vehicles. This kit is specifically designed for GM Gen III engines and provides a seamless solution for adapting LS engines to various popular transmissions. If you’re considering a project that involves swapping your LS engine into an older platform, this product is definitely worth your attention.

The package includes essential components a Trans Adapter Flexplate, six Gen III LS Flexplate bolts, an LS crank sleeve adapter, and a torque converter bolt kit. This comprehensive selection means that you’re not just buying a single piece but rather an entire kit that simplifies the installation process. Having everything in one package saves time and ensures compatibility, which is a significant advantage for anyone attempting this conversion.

One of the standout features of this flexplate adapter kit is its compatibility with 10.75″ and 11.066″ (11.1″) torque converter bolt patterns. This flexibility allows it to work with a variety of setups, which is crucial for automotive enthusiasts who may have different components in their builds. Additionally, the fact that it works with the factory LS starter is a game changer. It reduces conversion costs significantly, eliminating the need for additional starter purchases, which can add up quickly in a project budget.

Another feature that caught my attention is the flexplate’s thickness. At .035″ thicker than stock, it meets SFI 29.1 certification, which is crucial for those involved in motorsports or looking for added durability. This certification indicates that the product is built to withstand high-stress situations, giving me confidence in its reliability during operation. If you’re pushing your vehicle to its limits, having certified components is non-negotiable.

In terms of compatibility, this kit is designed for a broad range of GM LS engines, including the LS1, LS6, and even some truck engines like the L33 and L59. This extensive compatibility means that whether you’re working on a performance car or a truck, this flexplate adapter kit can be a vital part of your engine swap project. It adapts all these engines to TH350, 700R-4, 200-4R, 4L60, and Powerglide transmissions, which means a wider selection of options for your build.

To summarize, the DICMIC LS V8 Flexplate Adapter Kit is not just a product but a comprehensive solution for anyone looking to enhance their vehicle’s performance. Its thoughtful design, quality materials, and compatibility with a variety of engines and transmissions make it an excellent choice for both hobbyists and serious racers. If you’re contemplating an engine swap or upgrade, I highly recommend considering this kit as a crucial component of your project. It’s an investment in quality and performance that I believe will pay off in the long run.

Feature	Description
Included Components	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, SFI 29.1 certified
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, Powerglide

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4. 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

As someone deeply interested in automotive performance upgrades, I was genuinely excited to discover the Misakomo LS V8 Flexplate Adapter Kit. This product stands out for its remarkable compatibility with a wide range of GM engines and transmissions, making it an invaluable addition for anyone considering a swap to a Gen III LS engine. If you’re looking to streamline your engine swap process, this kit could very well be the answer.

The wide compatibility of this flexplate adapter kit is one of its most impressive features. It works seamlessly with both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns. This means that whether you’re integrating an LS1, LS2, LS6, or even the 4.8, 5.3, and 6.0 truck engines, you can rest assured that you have a reliable component that will fit perfectly with your existing setup. This flexibility not only saves time during installation but also opens up numerous options for torque converters, allowing you to tailor your performance build to your specific needs.

Another standout feature of the Misakomo LS V8 Flexplate Adapter Kit is its cost-saving design. By utilizing the factory LS starter, this adapter flexplate helps to significantly cut down conversion costs. This is especially beneficial for enthusiasts who want to maintain a budget while still achieving high performance. It’s a smart investment that allows you to leverage existing components rather than replacing everything, giving you more room to invest in other upgrades.

In terms of fitment, this kit is designed to accommodate a broad range of GM engines from 1997 to 2007, including various configurations of the LS series and truck engines. Specifically, it adapts to TH350, 700R4, 200-4R, 4L60, and Powerglide transmissions that originally supported non-LS engines, such as small block Chevy (SBC) or big block Chevy (BBC) V8s. This adaptability means that even if you are working with a vintage vehicle, you can modernize it with a powerful LS engine without the hassle of sourcing multiple parts.

However, it’s important to note that this kit may not be compatible with certain 1999-2000 LQ4 6.0 LS engines that came equipped with a 4L80E automatic transmission due to their unique crank flange design. This is a critical consideration for potential buyers, as it highlights the importance of verifying compatibility with your specific engine setup before making a purchase.

When purchasing the Misakomo LS V8 Flexplate Adapter Kit, you can expect a comprehensive package that includes everything you need for a successful LS swap. Each kit comes with a trans adapter flex plate, six Gen III LS flex plate bolts, a torque converter adapter sleeve, and a complete torque converter bolt kit. This all-inclusive offering ensures that you have all necessary components at your fingertips, allowing for a smooth installation process.

Overall, I believe that the Misakomo LS V8 Flexplate Adapter Kit is an outstanding choice for automotive enthusiasts looking to upgrade their engine. Its broad compatibility, cost-saving design, and comprehensive package make it a smart investment for anyone aiming to enhance their vehicle’s performance. If you’re considering an LS swap, I would highly recommend giving this kit serious thought. It not only simplifies the process but also enhances the overall performance of your vehicle, allowing you to enjoy a powerful and efficient driving experience.

Feature	Description
Wide Compatibility	Works with 10.75″ and 11.066″ torque converter bolt patterns
Cost-Saving	Utilizes factory LS starter to reduce conversion costs
Fitment	Compatible with a range of GM LS and truck engines, adapting to multiple transmission types
Package Includes	Comprehensive kit with flex plate, bolts, adapter sleeve, and torque converter bolt kit
Note	Not compatible with certain 1999-2000 LQ4 6.0 LS engines with 4L80E transmission

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Why an LS to TH350 Adapter is Essential for My Build

When I decided to swap my LS engine into my classic car, I quickly realized that pairing it with the right transmission was crucial for achieving the performance I desired. That’s when I stumbled upon the LS to TH350 adapter. This adapter has made my life so much easier, allowing me to connect my modern engine to a reliable and well-known transmission without the hassle of a complete drivetrain overhaul.

One of the biggest advantages I found with this adapter is its ability to maintain the original aesthetics of my vehicle. I wanted to keep that classic look while benefiting from the efficiency and power of an LS engine. The adapter seamlessly connects the two components, allowing me to enjoy the best of both worlds. It feels great knowing I can drive my car with modern reliability while still turning heads with its vintage charm.

Additionally, the installation process was straightforward, which saved me a significant amount of time and frustration. Instead of fabricating custom mounts or worrying about compatibility issues, the adapter provided a plug-and-play solution that fit perfectly. This ease of installation means I can spend more time enjoying my car on the road rather than stuck in the garage troubleshooting complex problems. Overall, the LS to TH350 adapter has proven to

Buying Guide for LS to TH350 Adapter

Understanding the Need for an Adapter

When I embarked on my journey to swap an LS engine into my classic car, I quickly realized that I needed an adapter to connect my LS engine to the TH350 transmission. This adapter is essential for ensuring that the engine and transmission work seamlessly together, allowing for optimal performance.

Types of LS to TH350 Adapters

There are various types of adapters available for LS to TH350 conversions. Some adapters are simple plates that facilitate the connection, while others may include additional components such as flexplates or starter mounts. I found it crucial to understand the differences to choose the right one for my project.

Material Quality

In my experience, the material quality of the adapter can greatly affect its durability and performance. I noticed that aluminum and steel are common materials used in these adapters. Aluminum is lightweight and resistant to corrosion, while steel tends to be more robust and can handle higher torque loads. I had to consider my specific needs and the driving conditions I expected.

Compatibility Factors

Compatibility was a big concern for me. I needed to ensure that the adapter I chose would fit my specific LS engine and TH350 transmission model. I spent time researching the dimensions and specifications to avoid any potential issues during installation. Always check the compatibility with your engine and transmission before making a purchase.

Installation Process

The installation process for the LS to TH350 adapter can vary based on the design and my vehicle setup. Some adapters are designed for a straightforward bolt-on process, while others may require modifications to the bell housing or even the transmission itself. I carefully reviewed installation instructions and videos to prepare for the task ahead.

Price Considerations

Pricing for LS to TH350 adapters can vary widely. I found that while some budget options exist, investing a little more for a high-quality adapter can save money in the long run by avoiding potential failures. I set a budget that aligned with my project goals but remained flexible for quality options.

Customer Reviews and Recommendations

Before finalizing my decision, I looked into customer reviews and feedback. Hearing from others who had completed similar swaps helped me gauge the effectiveness and reliability of different adapters. I appreciated insights on installation ease and performance after the conversion.

Final Thoughts

Choosing the right LS to TH350 adapter is a crucial step in my engine swap project. By considering the types, materials, compatibility, installation process, pricing, and reviews, I felt more confident in my decision-making. This guide has helped me outline what to look for, ensuring that I select an adapter that meets my needs and supports my automotive aspirations.

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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