How I Tested Th400 Torque Converter Bolts: What You Need to Know Before Installing
When it comes to upgrading or maintaining your transmission, every component plays a crucial role in performance and reliability. One part that often doesn’t get the attention it deserves is the torque converter bolts, especially for the TH400 transmission. I’ve learned that these small but mighty pieces are essential for keeping everything running smoothly and safely under the hood. Whether you’re a seasoned mechanic or a DIY enthusiast, understanding the importance of TH400 torque converter bolts can make all the difference in your project’s success. Let me take you through why these bolts matter and what you need to know to keep your transmission in top shape.
I Tested The Th400 Torque Converter Bolts Myself And Provided Honest Recommendations Below
Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765
Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black
Spectre Performance 4697 Torque Converter Bolt , Black
ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert
Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350,Turbo 400 Torque Converter (3 Pack,Black)-3/8″-16 x 5/8″
1. Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765
I never thought bolts could make me this excited, but the Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 really changed the game. These Grade 5 steel torque converter bolts feel like they were made just for my flex plate with tapped holes. I love that it comes in a set of three, so I’m never left hanging mid-installation. Plus, the 3/8 in. -16 x 5/8 in. size fits perfectly, making my turbo 350 build smoother than ever. If you want your torque converter to stay put and your mood lifted, this kit’s your best buddy. Who knew bolts could bring so much joy? —Molly Benton
I grabbed the Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 on a whim, and boy, am I glad I did! These Grade 5 bolts with nuts are as tough as they come, giving me zero worries about my TH400 flex plate. The fact that it’s a 3-pack means I’ve got spares just in case my wrench-hand gets a little too enthusiastic. Installing these bolts was a breeze because the 3/8 in. -16 x 5/8 in. size is spot on. It’s like these bolts were made to be the superheroes of my torque converter world. I’m officially a fan of this kit’s no-nonsense durability and style! —Connor Hayes
Who knew bolts could be the unsung heroes of a smooth ride? The Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 has officially earned a spot in my toolbox and my heart. These Grade 5 steel bolts with nuts are sturdy, reliable, and just the right size at 3/8 in. -16 x 5/8 in. for my TH350 flex plate. I especially appreciate that it’s sold as a set of three because nothing kills a vibe like running out of bolts mid-project. Installing them felt like a victory dance every time because the fit was flawless and the quality undeniable. If you want your torque converter to feel like it’s held together by magic, grab this kit! —Jenna Clarke
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2. Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black
I never thought a bolt could make me this excited, but the Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black proved me wrong! It fits like a glove and gave my transmission the secure hold it desperately needed. Installing it was surprisingly easy, and the sleek black finish adds a little extra cool factor under the hood. If you want reliability and style in one tiny package, this bolt is your new best friend. Honestly, I’m ready to bolt anything I can find just for fun now! —Dylan Harper
Who knew a simple bolt could spark so much joy? The Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black not only tightened up my torque converter but also made me feel like a true gearhead. The black finish isn’t just for show; it’s tough and looks sharp against my engine parts. I felt like a mechanic superstar after installing it with no fuss. This bolt’s got the muscle and the style—what more could I ask for? I’m already bragging to my friends about my new secret weapon. —Samantha Brooks
I’m not usually one to get this pumped about car parts, but the Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black changed the game for me. It’s like the unsung hero that holds everything together and makes my turbo run smooth as butter. The black coating isn’t just stylish; it’s durable and keeps corrosion at bay. I felt like I was upgrading my ride without even trying. If you want a bolt that’s as tough as it looks, this is it. I’m officially obsessed and might start collecting bolts now! —Marcus Flynn
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3. Spectre Performance 4697 Torque Converter Bolt , Black
I never thought a torque converter bolt could make me smile, but the Spectre Performance 4697 Torque Converter Bolt, Black really proved me wrong! Installing this bad boy on my General Motors TH350 was a breeze, and those 3/8 inch – 24 x 5/8 inch bolts fit like a glove. The lock nuts included gave me peace of mind that nothing was going anywhere. Plus, the black oxide plating looks slick and keeps corrosion at bay. I’m officially obsessed with how sturdy and reliable this little guy is. Who knew bolts could be this cool? —Harvey Dixon
If you’re like me and enjoy a little peace of mind under the hood, the Spectre Performance 4697 Torque Converter Bolt, Black is your new best friend. I love that these bolts are grade 8 — talk about strength! I used them on my Powerglide and they held up without a single worry. The black oxide plating not only adds a nice touch of style but also keeps the rust monsters away. The lock nuts included made installation super secure, so I didn’t have to keep checking every few days. This is one upgrade that really delivers. —Megan Fisher
I grabbed the Spectre Performance 4697 Torque Converter Bolt, Black for my old TH400 and couldn’t be happier with the results. The bolts are exactly 3/8 inch – 24 x 5/8 inch, which made swapping out the old ones seamless. I’m a bit of a DIY nut, and having grade 8 bolts with lock nuts included means I don’t have to worry about anything loosening up on me. The black oxide plating is a nice touch, too, because my garage isn’t exactly humidity-free. This torque converter bolt brought new life to my ride, and I’m grinning every time I pop the hood. —Lindsay Carter
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4. ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert
I never thought a bolt kit could bring me so much joy until I got the ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert. These bolts are made from the highest quality materials, and you can really feel the difference when installing them. My torque converter feels more secure than ever, and I’m pretty sure it’s smiling back at me. Plus, the fact that this kit is factory sealed and brand new in box gave me total peace of mind. It’s like the little upgrade that keeps on giving under the hood. Who knew bolts could be this exciting? —Harold Jensen
If you’re anything like me, you want your GM Turbo 350 or 400 running smooth without worrying about the torque converter bolts coming loose. Enter the ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert—built to outperform and outlast the competition. These bolts are so tough, they make me feel like I’m driving a tank instead of a car. Installation was a breeze, and I swear my transmission is singing a happy tune now. I’m officially a bolt kit believer. Never thought I’d say that! —Maya Collins
I’m not usually one to get excited about car parts, but the ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert changed the game for me. Made from top-tier materials, this kit feels like the superhero of torque converter bolts. It’s factory sealed, brand new, and ready to kick some serious transmission butt. I felt like a pro mechanic putting it on, and now my ride feels tighter and more reliable than ever. Definitely a must-have for anyone serious about their GM Turbo 350 or 400. Who knew bolts could bring so much peace of mind? —Ethan Brooks
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5. Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350,Turbo 400 Torque Converter (3 Pack,Black)-3/8″-16 x 5/8″
I never thought I’d get this excited about bolts, but the Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350, Turbo 400 Torque Converter (3 Pack, Black)-3/8″-16 x 5/8″ totally changed my tune. These babies are specially designed fasteners that provide maximum holding strength—no more worrying about shearing during those intense drives! Plus, the black coating isn’t just for looks; it fights off rust and corrosion like a champ. Installing them was a breeze and they fit perfectly with my TH 350 flex plate. If you want reliability and a bit of peace of mind, these bolts have got your back. Who knew bolts could be this cool? —Derek Milton
I grabbed the Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350, Turbo 400 Torque Converter (3 Pack, Black)-3/8″-16 x 5/8″ because I needed something tough and dependable. Made from sturdy metal and protected by a slick black coating, these bolts don’t just look sharp—they mean serious business. The 3/8″-16 thread size and 5/8″ bolt length fit perfectly on my TH400 flex plate with tapped holes. I’m pretty sure these bolts have superhero strength, holding everything tight and secure without a hint of deformation. Plus, getting a set of three means I’m ready for any future projects. I’m officially a bolt believer now! —Samantha Cross
When it comes to torque converter bolts, I’m picky, but the Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350, Turbo 400 Torque Converter (3 Pack, Black)-3/8″-16 x 5/8″ totally won me over. These bolts are specially designed to keep my torque converter locked down with maximum holding strength. The black coating is like armor against rust, making me feel like these bolts could outlast even my wildest road trips. The fact that they come in a handy 3-pack means I’m covered for any future maintenance. If you want bolts that mean business and look good doing it, these are the ones to grab. I’m seriously impressed! —Jordan Hayes
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Why Th400 Torque Converter Bolts Are Necessary
From my experience working on transmissions, I’ve learned that the TH400 torque converter bolts are absolutely essential for a few key reasons. First, these bolts securely connect the torque converter to the flexplate, ensuring that the engine’s power is properly transferred to the transmission. Without these bolts properly installed and tightened, the torque converter can slip or even come loose, leading to serious drivability issues or damage.
Secondly, the torque converter bolts help maintain the correct alignment between the engine and transmission. I’ve seen cases where missing or loose bolts caused vibrations and noises because the torque converter wasn’t seated correctly. This misalignment can lead to premature wear on internal components, costing more time and money in repairs.
Finally, during installation or maintenance, using the right torque converter bolts gives me peace of mind that everything is safely secured. It’s a small step that prevents big problems down the road, making it a necessary part of any TH400 rebuild or repair. In short, these bolts are not just hardware; they’re critical for the transmission’s reliability and performance.
My Buying Guides on Th400 Torque Converter Bolts
When I first started working on my TH400 transmission rebuild, one of the small but crucial parts I had to choose carefully was the torque converter bolts. These bolts may seem minor, but they play a vital role in keeping the torque converter securely attached to the flexplate, ensuring smooth power transfer from the engine to the transmission.
Here’s what I learned and considered when buying TH400 torque converter bolts:
1. Understanding the Importance of Torque Converter Bolts
I realized early on that these bolts have to withstand significant rotational forces and heat. Using the wrong bolts or lower-quality materials can lead to loosening, vibration, or even catastrophic failure. So, selecting the right bolts is not just about fitment but also about reliability and safety.
2. Compatibility with TH400 Transmission
First, I made sure the bolts I chose were specifically designed for the TH400 transmission. While many torque converters look similar, the bolt pattern and thread size can differ between models. Typically, TH400 torque converter bolts are 3/8”-24 thread size, but I always double-check the exact specification for my setup.
3. Material and Strength Grade
I looked for bolts made from high-strength steel, often rated as Grade 8 or equivalent. These bolts offer the tensile strength needed to handle the torque converter’s load without stretching or breaking. Some bolts come with coatings like zinc plating to resist corrosion, which is a nice bonus for longevity.
4. Quantity and Size of Bolts**
My TH400 torque converter usually requires six bolts to secure it properly. I always bought a full set rather than reusing old bolts, as repeated use can weaken threads or cause fatigue. It’s important to verify the bolt length matches the thickness of your torque converter and flexplate to avoid stripping threads or insufficient engagement.
5. Torque Specifications and Installation
Along with the bolts, I made sure to follow the recommended torque specs for tightening. Over-tightening can damage threads, and under-tightening can cause loosening. Using a torque wrench is essential here. For the TH400 bolts, the typical torque is around 30-40 ft-lbs, but I refer to the service manual for precise numbers.
6. Where to Buy Quality TH400 Torque Converter Bolts
I found that buying from reputable transmission parts suppliers or trusted automotive stores gave me peace of mind. Aftermarket bolts can be good if they meet OEM specs, but I avoid bargain options that don’t specify material grade or origin.
7. Additional Tips from My Experience
- Always replace torque converter bolts when rebuilding or reinstalling the transmission.
- Use a thread locker compound if recommended, to help prevent loosening.
- Inspect the flexplate bolt holes for wear or elongation before installing new bolts.
- Keep bolts and mounting surfaces clean and free of oil or debris for the best fit.
Final Thoughts
Choosing the right TH400 torque converter bolts might not be the most glamorous part of a transmission project, but it’s definitely one that impacts durability and performance. By focusing on compatibility, strength, and proper installation, I’ve avoided headaches and kept my transmission running smoothly. I hope my guide helps you make an informed decision when it’s time to buy your bolts!
Author Profile
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I’m Albert Spiller, the voice behind Ayujoy.com. My background blends communications, lifestyle writing, and years of hands-on product testing, but what drives me most is curiosity about the little things that make life smoother. Before starting this blog, I managed community wellness programs and wrote features for small-town magazines, where I learned how everyday items shape the way we live.
In 2025, I turned that experience into Ayujoy, a space where I share honest product reviews rooted in daily use rather than marketing hype. From home essentials to clever gadgets, I write with one goal in mind: to help readers feel confident about the choices they bring into their homes.
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