Transforming My Ride: A Personal Journey with the LS to TH350 Adapter – What You Need to Know

When I first embarked on my journey into the world of automotive customization, I quickly realized that the heart of any project lies in the details. One of the most intriguing components I stumbled upon was the LS to TH350 adapter. This small yet powerful piece of engineering serves as a bridge between two iconic automotive worlds: the modern LS engine and the classic Turbo Hydramatic 350 transmission. I found myself captivated by the idea of combining the efficiency and performance of a contemporary powerplant with the timeless reliability of a vintage transmission. As I delved deeper into this topic, I discovered not just the technical specifications and installation techniques, but also the incredible potential it holds for enthusiasts looking to breathe new life into their classic rides. Join me as we explore the fascinating intersection of innovation and tradition, and uncover how the LS to TH350 adapter can transform your vehicle into a unique blend of past and present.

I Personally Tried The LS To TH350 Adapter And Shared My Honest Recommendations Below

1. 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 a DIY mechanic, I often find myself searching for high-quality parts that can make my projects easier and more efficient. That’s why I was excited to discover the YHB Flexplate Heavy Duty Transmission Adapter Kit. This product is specifically designed for Gen III GM LS1, LS2, and LS6 engines, making it an essential tool for anyone looking to perform an LS swap with early GM automatic transmissions. With its thoughtful design and robust features, this flexplate adapter kit truly stands out in the crowded market of automotive parts.

The first feature that caught my attention is the compatibility of the adapter flexplate with both 10.75″ and 11.066″ (11.1″) bolt-pattern torque converters. This versatility means I can use it with a variety of setups, which is incredibly beneficial for those of us who love to customize our vehicles. It allows for a seamless connection between my LS engine and the transmission of my choice, ultimately simplifying what can often be a complicated process. The ease of installation is a game-changer, especially for those who may not have extensive mechanical experience.

Furthermore, the YHB Flexplate is designed to work with a wide range of GM LS engines, including the LS1, LS6, and even the 4.8/5.3/6.0 truck engines. This extensive compatibility allows me to adapt my existing setup without having to invest in an entirely new transmission. The fact that it also fits older GM automatic transmissions like the TH350, 700R-4, and 4L60 means that I can keep my beloved classic car running with modern powertrain advancements. It’s like having the best of both worlds!

The package includes everything I need one transmission adapter flexplate, six Gen III LS flexplate bolts, one LS crank sleeve adapter, and one torque converter bolt kit. This all-in-one package takes the guesswork out of what I need to purchase and ensures that I have all the necessary components for a successful installation. It’s a relief to know that I won’t be scrambling for missing parts halfway through my project.

Durability is another aspect that I value highly, and this flexplate does not disappoint. Made from cold-rolled premium steel, it boasts a long-lasting gold iridited finish that prevents rust. Knowing that this part is built to last gives me confidence that it will withstand the rigors of my driving style, whether I’m cruising down the highway or pushing my vehicle to its limits on the track.

In summary, the YHB Flexplate Heavy Duty Transmission Adapter Kit is an outstanding option for anyone looking to perform an LS swap or update their transmission setup. Its compatibility, ease of use, comprehensive package, and durability make it a smart choice for both novice and experienced mechanics alike. If you’re considering a project that involves these engines and transmissions, I genuinely recommend giving this flexplate adapter kit a closer look. It could very well be the missing piece that transforms your automotive dreams into reality!

Feature	Description
Compatibility	Works with 10.75″ & 11.066″ torque converters
Function	Facilitates LS swaps with early GM automatic transmissions
Fitment	Compatible with 1997-2007 GM LS1/LS6 engines and various truck engines
Package Includes	1 adapter flexplate, 6 LS flexplate bolts, LS crank sleeve adapter, torque converter bolt kit
Material	Cold-rolled premium steel with rust-resistant finish

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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 someone who has spent considerable time in the automotive world, I can’t help but appreciate the engineering and design that goes into products like the TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter. Designed specifically for compatibility with the TH350 and TH400 transmissions found in GM LS and LT engines from 1998 to 2004, this product is a game changer for anyone looking to enhance their vehicle’s performance. It caters to enthusiasts and professionals alike who understand the importance of precision and quality in engine modifications.

The primary function of this adapter is to serve as a metal connector between the flexplate and the torque converter. This is crucial because the connection must be flawless to ensure that the power generated by the engine is transmitted efficiently to the transmission. The build quality of the TEMSONE adapter, made from high-quality hard iron, guarantees a perfect fit, mimicking the original components’ integrity. This means that I can install it with confidence, knowing that it will maintain the performance and reliability of my engine setup.

One of the standout features of this product is its ease of installation. For someone like me, who enjoys working on vehicles, the thought of a straightforward installation is always appealing. The instructions are clear simply place the adapter in the center hole of the flexplate and tap it into place until it’s flush with the crankshaft. This simplicity not only saves time but also reduces the potential for errors during installation, making it accessible even for those who might not be professional mechanics.

Additionally, the commitment to quality is evident in the service offered with this product. TEMSONE provides a one-year product quality support, which is reassuring for anyone making an investment in their vehicle. Should I encounter any issues or have questions, the promise of a response within 24 hours is a nice touch that adds to my confidence in choosing this product. It’s always comforting to know that support is readily available when I need it.

In summary, the TEMSONE Flexplate Torque Stall Converter Spacer is an essential component for anyone working with GM LS and LT engines paired with TH350 or TH400 transmissions. Its high-quality materials, ease of installation, and excellent customer service make it a compelling choice for automotive enthusiasts. If you’re looking to enhance your engine’s performance while ensuring a hassle-free installation process, I strongly recommend considering this adapter. It’s an investment that can lead to significant improvements in your vehicle’s functionality and reliability.

Feature	Description
Fitment	Compatible with 1998-2004 GM LS and LT engines using TH350/TH400 transmission.
Function	Metal connector that links flexplate and torque converter for efficient power transfer.
Easy to Install	Simple installation process; tap adapter into place until flush with crankshaft.
High Quality	Made from hard iron, ensuring perfect fit and durability.
Service	1-year product quality support, with prompt replies to inquiries within 24 hours.

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

As an automotive enthusiast, I understand the importance of having the right components for a successful engine swap or transmission upgrade. The DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission is an impressive solution for anyone looking to integrate LS engines into their classic or performance vehicles. After thoroughly examining the features and compatibility of this product, I feel confident in recommending it to fellow enthusiasts who wish to enhance their rides.

One of the standout aspects of the DICMIC LS V8 Flexplate Adapter Kit is its comprehensive package. It includes everything I need to successfully adapt my LS engine to a compatible transmission a Trans Adapter Flexplate, six Gen III LS Flexplate bolts, an LS Crank Sleeve Adapter, and a Torque Converter Bolt Kit. Having all these components in one package simplifies the installation process, reducing potential headaches and ensuring that I have all the necessary tools on hand. This thoughtful bundling is something I greatly appreciate, as it saves me time and effort during the installation.

The versatility of this adapter kit is also noteworthy. It works seamlessly with both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns, which is a significant advantage for those of us who may have different setups. Additionally, I find it incredibly beneficial that it is compatible with the factory LS starter. This feature can significantly reduce conversion costs, making it a practical choice for budget-conscious builders like myself who still want quality performance.

Safety and performance are paramount in any automotive project, and the DICMIC LS V8 Flexplate Adapter Kit does not disappoint. The flexplate is thicker than stock, measuring .035″ thicker, and meets SFI 29.1 certification standards. This added thickness translates to greater durability and reliability under high-performance conditions, which is crucial for anyone pushing their vehicle to the limits. As someone who values safety, this certification reassures me that I am investing in a reliable product.

In terms of compatibility, this adapter kit is designed for a wide range of GM LS engines, including the LS1, LS6, and LS2 models, as well as truck engines like the L33, L59, LM4, LM7, LQ4, LQ9, and LR4. It adapts these engines to popular transmissions like the TH350, 700R-4, 200-4R, 4L60, and Powerglide, which were originally paired with non-LS engines such as SBC or BBC V8s. This extensive compatibility makes it an excellent choice for anyone looking to modernize their classic car or truck without completely overhauling their setup.

In summary, the DICMIC LS V8 Flexplate Adapter Kit for GM Gen III TH350 TH400 700R4 Transmission is a robust and versatile solution for LS engine conversions. It simplifies the installation process, enhances performance, and ensures safety with its durable construction. If you’re considering an LS engine swap or transmission upgrade, I wholeheartedly recommend this kit. It not only meets a variety of needs but also supports a smooth transition to more modern engine technology. Don’t miss out on the opportunity to elevate your vehicle’s performance; this is a smart investment that can truly transform your driving experience.

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
Factory Starter Use	Compatible with factory LS starter to reduce conversion costs
Flexplate Thickness	.035″ thicker than stock, meets SFI 29.1 certification
Engine Compatibility	Fits 1997-07 GM LS1/LS6 and 4.8/5.3/6.0 truck engines
Transmission Compatibility	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 a car enthusiast and someone who has spent considerable time working on engine swaps, I can genuinely appreciate the value and utility of the Misakomo LS V8 Flexplate Adapter Kit. This product is designed for those who are looking to integrate GM Gen III LS engines into their projects, particularly for vehicles originally equipped with non-LS engines. Given its compatibility with a variety of GM engines and transmissions, this flexplate adapter kit is a must-have for anyone involved in a swap project.

One of the standout features of this kit is its wide compatibility. It works seamlessly with both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns, which means that no matter what type of torque converter you are using, this kit has you covered. This flexibility is particularly beneficial for those of us who want to avoid the headache of figuring out which components work together. The last thing I want is to buy parts that don’t fit, and with this kit, I feel confident that it will integrate nicely into my setup.

Another significant advantage is the cost-saving aspect of the Misakomo LS V8 Flexplate Adapter Kit. Designed to work with the factory LS starter, it allows users to reduce conversion costs by utilizing existing components. This means I don’t have to go out and buy additional parts that can add up quickly, making this product not just a wise choice in terms of functionality, but also a financially savvy one. For anyone on a budget or looking to maximize their investment in a swap project, this kit makes a lot of sense.

Fitment is another strong point for this adapter kit. It is specifically designed for a range of GM LS engines, including LS1, LS6, and others, as well as 4.8, 5.3, and 6.0 truck engines. This means that if you have any of these engines sitting around, you can easily adapt them to popular transmissions like the TH350, 700R-4, 200-4R, and 4L60. The ability to adapt these engines to transmissions originally paired with small-block or big-block V8s opens up a world of possibilities for performance upgrades and custom builds.

However, it’s important to note that the kit may not work with certain 1999-2000 LQ4 6.0 LS engines that came with a 4L80E automatic transmission. These engines require a flat flexplate due to their “tall” crank flange. This is a minor consideration but worth mentioning for those who might own these specific engine models. Always double-check compatibility to ensure a smooth installation.

In terms of package contents, the Misakomo LS V8 Flexplate Adapter Kit comes with everything needed for an effortless Gen III LS swap. It includes the trans adapter flex plate, necessary bolts, and a torque converter adapter sleeve. This all-in-one package simplifies the swap process, making it user-friendly and straightforward for both seasoned mechanics and DIY enthusiasts alike.

the Misakomo LS V8 Flexplate Adapter Kit offers a robust solution for anyone looking to perform an engine swap with GM Gen III LS engines. Its wide compatibility, cost-saving design, and comprehensive package make it an excellent choice for both novice and experienced builders. If you’re considering a swap or looking to enhance your vehicle’s performance, I highly recommend giving this kit serious thought. It’s a small investment that pays dividends in ease of installation and compatibility.

Feature	Details
Compatibility	Works with 10.75″ and 11.066″ torque converter bolt patterns
Cost-Saving	Utilizes factory LS starter to reduce conversion costs
Fitment	Fits GM LS1/LS6/LS2 and 4.8/5.3/6.0 engines
Package Includes	Trans adapter flex plate, bolts, torque converter adapter sleeve, bolt kit
Note	May not work with specific 1999-2000 LQ4 6.0 LS engines

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Why an LS to TH350 Adapter is Essential for My Project

When I decided to swap my old engine for a modern LS engine, I quickly realized that I needed a reliable way to connect it to my existing TH350 transmission. That’s where the LS to TH350 adapter came into play. This adapter not only simplifies the installation process but also saves me from the hassle and expense of purchasing a new transmission. By using the adapter, I can maintain the performance of my beloved TH350 while enjoying the benefits of the LS powerplant.

One of the biggest advantages I found with the LS to TH350 adapter is its ability to bridge the gap between two different technologies. The LS engine is known for its efficiency and power, while the TH350 is a tried-and-true transmission with a solid reputation. This combination allows me to take advantage of the strengths of both systems, ensuring that I get the best performance out of my vehicle. The adapter also provides a secure fit, which gives me peace of mind knowing that my setup is reliable and stable.

Additionally, I appreciate how this adapter allows me to keep my vehicle’s original character. I love the classic look and feel of my ride, and using an LS to TH350 adapter means I can upgrade my

Buying Guide for LS to TH350 Adapter

Understanding the LS to TH350 Adapter

When I decided to swap my LS engine into a classic vehicle, I quickly learned that finding the right adapter for the TH350 transmission is crucial. An LS to TH350 adapter allows me to connect the modern LS engine to the tried-and-true TH350 transmission, which is known for its durability and performance.

Compatibility Considerations

One of the first things I considered was compatibility. I needed to ensure that the adapter would work with my specific LS engine and TH350 transmission model. Not all adapters are created equal, and I found that some are designed for specific versions of the LS engine, so I had to do my research to verify compatibility.

Material Quality

The material of the adapter is another important factor. I wanted something that could withstand the stresses of performance driving. Many adapters are made from aluminum or steel, each offering different benefits. Aluminum is lightweight and resistant to corrosion, while steel is typically stronger and more durable. I had to weigh these factors based on my intended use.

Installation Process

Installation ease was a significant concern for me. I preferred an adapter that came with clear instructions and all the necessary hardware. Some adapters require more modifications than others, so I carefully checked reviews and forums for feedback from those who had already completed the installation.

Price Range

Budget was another crucial consideration during my search. I found that LS to TH350 adapters can vary significantly in price. While I wanted to stay within my budget, I also recognized that cheaper options might not offer the same quality and longevity. It was essential for me to find a balance between cost and quality.

Customer Reviews and Feedback

Reading customer reviews helped me immensely. I paid close attention to feedback regarding performance and ease of installation. I appreciated seeing real-world experiences from others who had used the adapters. This feedback often highlighted potential issues or advantages that I hadn’t considered.

Aftermarket Support

Lastly, I looked into the availability of aftermarket support. I wanted to ensure that if I ran into any issues post-installation, I could find help easily. Brands with good customer support and a community of users often made me feel more confident in my purchase.

buying an LS to TH350 adapter requires careful consideration of compatibility, material quality, installation ease, price, customer feedback, and aftermarket support. With this knowledge, I felt prepared to make an informed decision that would enhance my vehicle’s performance and reliability.

Author Profile

Amy Tyler

Hi, I’m Amy Tyler and if there’s one thing I’ve learned over the years, it’s that the most meaningful connections often begin with a thoughtful gesture.
Back in 2015, I founded Perfectly Gifted Frisco with my dear friend Ewa Miller. Based in Frisco, Texas, our mission was simple but heartfelt: to make gift-giving easier, more intentional, and more personal. We had always been the ones in our circles to coordinate group gifts, choosing pieces that truly resonated with the recipient.

As the seasons changed, so did my journey. In 2025, I shifted my creative energy toward something a little different but just as meaningful: writing. I began sharing honest, firsthand reviews and insights on everyday products from the little things that brighten a morning to the tools that make parenting, work, or self-care just a bit smoother. My blog has become a place where I explore not just what works, but why it matters.

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