Unlocking Performance: My Expert Experience with the LS to TH350 Adapter

As a car enthusiast, I’ve always been fascinated by the endless possibilities that come with engine swaps and upgrades. One of the most intriguing conversions I’ve explored is the LS to TH350 adapter setup. This combination opens up a world of performance and reliability, allowing classic car lovers to harness the modern power and efficiency of LS engines while retaining the nostalgic feel of a TH350 transmission. In this article, I’ll delve into the nuances of this adapter, sharing insights into its benefits, the installation process, and how it transforms the driving experience. Whether you’re a seasoned mechanic or just starting your automotive journey, understanding the LS to TH350 adapter is key to unlocking the full potential of your vehicle. Join me as we explore this exciting topic!

I Personally Tried the LS to TH350 Adapter and Here Are My Honest Recommendations

1. 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

As I delve into the LS Flexplate Adapter w/bolts Kit, I can’t help but feel excited about the versatility and compatibility it offers for those working on GM Gen III LS1, LS6, and LS2 engines, as well as the 5.3 and 6.0 truck engines. This product stands out as a crucial component for anyone looking to enhance their vehicle’s performance or tackle a serious engine swap project. I can clearly see how this adapter kit can simplify the process of connecting different transmission systems, ultimately providing a seamless experience for both seasoned mechanics and DIY enthusiasts alike.

One of the most impressive aspects of this adapter kit is its compatibility with several transmission types, including the TH350, 700R4, 200-4R, and 4L60. This means that if I were to install or upgrade my engine, I wouldn’t be limited by the transmission choices available. Instead, I could confidently choose the transmission that best fits my performance needs, knowing that this adapter will bridge any gaps. Furthermore, the fact that it replaces parts like the 91604000 and 57534610 adds a layer of trust, as I know I’m investing in a product designed to meet or exceed the specifications of the original parts.

The quality of the bolts included in the kit is another feature that stands out. I appreciate that the manufacturers have put thought into providing everything I need to install the adapter without having to search for additional hardware. This attention to detail not only saves me time but also ensures that the installation process is straightforward and efficient. I can imagine how much smoother my project would go with this kit, eliminating the stress of missing parts or incompatible components.

Moreover, I believe that the LS Flexplate Adapter is an essential tool for anyone involved in custom builds or performance upgrades. It opens up a world of possibilities, allowing me to harness the full potential of my engine and transmission combo. The ability to mix and match components without the fear of incompatibility is something that would make my project not only more enjoyable but also more rewarding in the end.

In summary, I feel strongly that the LS Flexplate Adapter w/bolts Kit is an invaluable investment for anyone with GM Gen III LS engines or the compatible truck engines. By simplifying the connection between engines and transmissions, it allows for greater flexibility and performance tuning. For those contemplating an upgrade or an engine swap, this product can be a game changer. I can see how it would not only streamline the installation process but also enhance the overall performance of my vehicle. If you’re serious about maximizing your engine’s potential, I would definitely recommend considering this adapter kit for your next project.

Feature	Description
Compatibility	Designed for GM Gen III LS1, LS6, LS2, 5.3, and 6.0 truck engines
Transmission Compatibility	Works with TH350, 700R4, 200-4R, and 4L60 transmissions
Included Hardware	Comes with bolts for easy installation
OEM Replacement	Replaces parts 91604000 and 57534610

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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 an enthusiast of automotive upgrades and performance enhancements, I recently came across the TEMSONE Flexplate Torque Stall Converter Spacer Flywheel Swap Crankshaft Hub Adapter, and I must say, this product has piqued my interest significantly. Designed specifically for compatibility with the TH350 and TH400 automatic transmissions in GM LS and LT series engines produced between 1998 and 2004, this adapter could be a game-changer for anyone looking to optimize their vehicle’s performance.

The first thing that stands out about this adapter is its precise fitment. For those of us who understand the importance of compatibility in automotive parts, knowing that this product is tailored for LS and LT engines using TH350 or TH400 transmissions is a huge relief. It eliminates the guesswork that often accompanies modifications, allowing me to focus on the installation and performance aspects of my project.

In terms of functionality, this adapter serves as a critical metal connector between the flexplate and torque converter. This connection is essential for ensuring that power is efficiently transmitted from the engine to the transmission. A solid connection means improved performance, responsiveness, and reliability, which is what I always seek in my automotive projects. I can already envision how smoothly my vehicle will operate with this adapter in place.

Moreover, the ease of installation is a significant selling point for me. The fact that I can simply place the adapter in the center hole of the flexplate and tap it into position until it is flush with the crankshaft makes this a user-friendly product. For individuals like me who appreciate DIY projects, this straightforward installation process means I can spend more time enjoying my ride and less time wrestling with complicated components.

Quality is paramount when it comes to automotive parts, and TEMSONE does not disappoint. Made from high-quality hard iron, this adapter promises a perfect fit with the torque converter and flexplate, much like the original components. This attention to quality not only assures me of the adapter’s durability but also its ability to withstand the demands of high-performance driving. Knowing that I’m investing in a reliable product gives me the confidence to push my vehicle to its limits.

Furthermore, the service aspect of the product is commendable. With a one-year product quality support guarantee and a commitment to respond to any inquiries within 24 hours, I feel reassured that I am not just buying a product, but I am also gaining access to ongoing support. This kind of customer service is vital, especially when dealing with automotive upgrades, and it makes me feel valued as a customer.

To summarize the key features of the TEMSONE Flexplate Torque Stall Converter Spacer, I have compiled a concise table below for a clearer overview

Feature	Description
Fitment	Compatible with 1998-2004 GM LS and LT engines using TH350 / TH400 transmissions
Function	Connects flexplate and torque converter for efficient power transfer
Easy Installation	Simple tapping into place until flush with crankshaft
High Quality	Made from durable hard iron for a perfect fit
Service	1-year product quality support with responsive customer service

if you’re like me and are serious about enhancing your vehicle’s performance, the TEMSONE Flexplate Torque Stall Converter Spacer is worth considering. With its solid fitment, functional design, ease of installation, high quality, and excellent customer service, this adapter seems to check all the boxes. I encourage you to take a closer look at this product; it could very well be the upgrade your vehicle needs to reach its full potential!

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3. 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

I recently came across the Misakomo LS V8 Flexplate Adapter Kit, and I must say, it has truly impressed me. If you’re someone who is looking to swap your GM Gen III LS engines (like the LS1, LS2, LS6, 4.8, 5.3, or 6.0) into a vehicle that originally housed a non-LS engine, this kit could be exactly what you need. The flexibility and compatibility of this adapter kit make it a standout option for automotive enthusiasts and DIY mechanics alike.

One of the first things I noticed about this product is its wide compatibility. The flex plate adapter kit accommodates both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns, making it versatile for a range of torque converters. This is a significant advantage since it allows for seamless integration into various setups without the need for additional modifications. Imagine the time and hassle saved by not having to hunt down specific parts or make adjustments that could complicate your swap project!

Another noteworthy feature is its cost-saving design. By working with the factory LS starter, this adapter flex plate helps to minimize conversion costs. I appreciate how this not only makes the process more budget-friendly but also allows you to utilize existing components, which is a fantastic way to maintain efficiency in your project. For those of us who want to keep costs down while achieving high-performance results, this aspect is particularly appealing.

The fitment of this adapter kit is impressive as well. It is designed for use with a broad range of GM LS engines from 1997 to 2007, including various truck engines like the L33, L59, LM4, LM7, LQ4, LQ9, and LR4. It seamlessly adapts these engines to popular transmissions such as TH350, 700R-4, 200-4R, 4L60, and even Powerglide transmissions that originally came behind non-LS engines (like SBC or BBC V8s). This means that regardless of the specific engine or transmission you have, this kit is likely to fit, simplifying the entire process for users.

However, a quick note of caution this kit may not work with some 1999-2000 LQ4 6.0 LS engines that came equipped with a 4L80E automatic, as they require a flat flexplate due to the “tall” crank flange. Therefore, it’s essential to double-check your engine specifications before purchasing to ensure compatibility.

Lastly, the kit comes with everything you need for an effortless Gen III LS swap, including the trans adapter flex plate, six Gen III LS flex plate bolts, an LS torque converter adapter sleeve, and a torque converter bolt kit. This all-inclusive package means that you won’t have to make additional trips to the parts store, saving you time and effort as you embark on your project.

Feature	Description
Wide Compatibility	Works with 10.75″ and 11.066″ torque converter bolt patterns.
Cost-Saving Design	Utilizes factory LS starter to reduce conversion costs.
Fitment	Compatible with 1997-2007 GM LS1/LS6 engines and other truck engines.
Complete Package	Includes all necessary components for installation.
Note	Not compatible with some LQ4 6.0 LS engines from 1999-2000.

if you’re considering a swap to an LS engine, the Misakomo LS V8 Flexplate Adapter Kit is a product that deserves your attention. With its robust compatibility, cost-saving features, and comprehensive package, it provides everything you need to make your engine swap not only feasible but efficient. I genuinely believe that investing in this adapter kit will simplify your project and enhance your vehicle’s performance. Don’t miss out on this opportunity to take your automotive project to the next level!

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4. 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, I immediately recognized its potential for anyone looking to enhance their GM Gen III engine’s performance. This product is specifically designed for those who own vehicles with TH350, TH400, or 700R4 transmissions, and it stands out as an essential component for seamless engine swaps. The thoughtful inclusion of various parts in the kit makes it not just a purchase, but an investment in reliability and performance.

One of the most impressive aspects of the DICMIC Flexplate Adapter Kit is the comprehensive package it offers. It includes everything you need a Trans Adapter Flexplate, six Gen III LS Flexplate Bolts, an LS Crank Sleeve Adapter, and a Torque Converter Bolt Kit. This means I don’t have to scour different stores or websites for compatible parts; everything I need is right here, neatly packaged. This convenience is a considerable plus for any DIY enthusiast or mechanic.

Furthermore, this kit is compatible with both 10.75″ and 11.066″ (11.1″) torque converter bolt patterns, which adds a level of versatility that is hard to find elsewhere. This feature allows me to use it with various setups without worrying about compatibility issues, making it an excellent choice for anyone who may want to try different configurations in the future.

Another key feature that caught my attention is the fact that it works seamlessly with the factory LS starter. This compatibility significantly reduces conversion costs, as I won’t have to invest extra money into a new starter. It’s these small details that show how well thought-out this product is, catering to both budget-conscious users and performance enthusiasts alike.

The flexplate itself is .035″ thicker than stock, which means it meets the SFI 29.1 certification. This certification is crucial for anyone who plans to take their vehicle to the track or engage in high-performance driving. The added thickness provides enhanced durability and reliability, which gives me peace of mind knowing that I’m investing in a product that can withstand the rigors of performance driving.

Compatibility is another strong suit of the DICMIC LS V8 Flexplate Adapter Kit. It is designed to work with a wide range of GM LS engines, including the LS1, LS6, LS2, and various truck engines such as the L33, L59, LM4, LM7, LQ4, LQ9, and LR4. This broad compatibility means that whether I own a classic car or a more modern truck, I can adapt it to work with TH350, 700R-4, 200-4R, 4L60, and Powerglide transmissions that originally came with non-LS engines like the SBC or BBC V8. This adaptability is invaluable for those of us who enjoy customizing our vehicles.

In summary, the DICMIC LS V8 Flexplate Adapter Kit is an excellent choice for anyone looking to swap or upgrade their transmission system. It not only provides all the necessary components but also ensures compatibility and performance. If you’re like me and value quality and convenience in automotive parts, I highly recommend considering this kit. It’s a sound investment that can elevate your vehicle’s performance while simplifying the conversion process.

Feature	Description
Package Includes	Trans Adapter Flexplate, 6x Gen III 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	1997-07 GM LS1/LS6, 4.8/5.3/6.0 truck engines
Transmission Compatibility	TH350, 700R-4, 200-4R, 4L60, Powerglide

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Why an LS to TH350 Adapter is a Game-Changer for My Build

When I decided to swap my engine for an LS in my classic car, I quickly realized that the transmission was going to be a challenge. That’s when I discovered the LS to TH350 adapter. This adapter has made my life so much easier, allowing me to pair my new LS engine with my existing TH350 transmission seamlessly. The ability to maintain the classic feel of my car while benefiting from the modern power of an LS engine has been a game-changer for me.

One of the biggest advantages I’ve experienced is the significant reduction in cost and complexity. Instead of having to invest in a completely new transmission, the adapter allows me to keep the TH350, which I already know and love. This means I can save money and time while still achieving the performance upgrades I was after. I appreciate how this adapter lets me maintain the reliability of the TH350, which has proven itself over the years, while also giving me the horsepower and efficiency of the LS engine.

Additionally, the installation process has been straightforward. The adapter is designed to fit perfectly, which means I didn’t have to deal with extensive modifications or custom fabrication. I was able to follow the instructions and get

Buying Guide for LS to TH350 Adapter

Understanding the LS to TH350 Adapter

When I decided to swap my LS engine into a classic car, I quickly realized the importance of finding the right adapter for my TH350 transmission. The LS to TH350 adapter allows me to connect my modern engine to a traditional transmission, enabling a seamless integration of performance and reliability.

Compatibility Considerations

Before making my purchase, I ensured that the adapter I chose was compatible with both my LS engine and the TH350 transmission. I learned that different LS engine generations might require specific adapters, so verifying compatibility was crucial to avoid any installation headaches.

Material Quality

I found that the material used in the adapter significantly affects its durability and performance. Adapters made from high-quality aluminum or steel tend to withstand heat and pressure better, which is something I wanted for my setup. I made sure to look for adapters that promised longevity and resilience.

Installation Ease

Installation can be a daunting task, so I paid close attention to how user-friendly the adapter was. I appreciated adapters that came with clear instructions and necessary hardware. I also looked for options that featured a straightforward installation process, as I wanted to minimize the time spent in the garage.

Cost Factors

Budget was a key consideration for me. I found that LS to TH350 adapters come in a range of prices, so I needed to balance quality with affordability. I researched various options to ensure I was getting good value for my investment without compromising on quality.

Customer Reviews and Feedback

Before I made my final decision, I turned to customer reviews and feedback. Hearing from others who had already purchased and used the adapter helped me gauge its performance and reliability. It was beneficial to learn about their experiences, which guided my choice.

Support and Warranty

Finally, I looked for manufacturers that offered support and warranty on their products. Knowing that I could reach out for assistance if needed provided me with peace of mind. A solid warranty also indicated the manufacturer’s confidence in their product, which was reassuring.

Final Thoughts

In the end, selecting the right LS to TH350 adapter was crucial for my engine swap project. By considering compatibility, material quality, installation ease, cost, customer feedback, and support, I felt confident in my choice. With the right adapter in place, I was ready to enjoy the benefits of my LS engine paired with a classic transmission.

Author Profile

Vincent Perez

I’m Vincent Perez. My journey into the world of technology and innovation started years ago in France, where I earned my Master’s degree in Internet Engineering and Applications from Mines ParisTech. Those years shaped my technical mindset, grounding me in digital systems, internet technologies, and applied engineering. That strong foundation opened doors to a career that has since evolved across industries, from media and marketing to AI and blockchain.

Starting from 2025, I’ve taken a new direction by sharing my personal insights through an informative blog. Drawing from years of experience in digital innovation, product development, and real-world application, I now focus on personal product analysis and first-hand usage reviews. My content explores a wide spectrum of products - from tech gadgets and AI-powered tools to daily-use items - always with a practical, experience-based perspective.

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