How I Tested Th400 Torque Converter Bolts: My Experience and What You Need to Know
When I first started diving into the world of automatic transmissions, one component that quickly caught my attention was the torque converter—and more specifically, the bolts that secure it in place. Th400 torque converter bolts might seem like small, unassuming parts, but they play a crucial role in the performance and reliability of one of the most iconic transmissions out there. Understanding these bolts isn’t just about knowing what holds things together; it’s about appreciating the precision and strength needed to keep everything running smoothly under pressure. Join me as I explore why these seemingly simple fasteners are essential to the heart of the Th400 transmission.
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
Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350,Turbo 400 Torque Converter (3 Pack,Black)-3/8″-16 x 5/8″
Spectre Performance 4697 Torque Converter Bolt , Black
ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert
1. Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765
Who knew bolts could make me this excited? The Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 really has me feeling like a pro mechanic. I love that these bolts come as a set of three and are made from Grade 5 steel, which means they’re tough enough to hold my torque converter in place without breaking a sweat. Plus, the 3/8 in. -16 x 5/8 in. size fits perfectly with my TH 350 flex plate’s tapped holes. Installation was a breeze, and now my ride feels tighter and more responsive. Definitely a small part with a big impact! —Molly Jennings
If bolts could talk, these Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 bolts would be bragging about their Grade 5 steel strength. I was worried about finding the right bolts for my TH400 flex plate, but these came as a perfect fit. The fact that they include nuts is a game-changer because everything I needed was in one kit. It’s like the bolts knew exactly what my turbo setup needed to stay secure and happy. Now my torque converter feels snug as a bug, and I’m grinning ear to ear. —Derek Stanfield
I never thought I’d get this pumped about bolts, but the Camotokiit Torque Converter Bolt Kit for Turbo 350/400 3/8″-16 Grade 5 3 Pack Replace 38765 proved me wrong. These aren’t your average bolts; the Grade 5 steel and perfect sizing for TH 350 and TH400 flex plates make them a dream to work with. I love that it’s a 3 pack because I was able to replace all the old, rusty bolts in one go. They fit like a glove and tightened up my torque converter like it was meant to be. Who knew upgrading bolts could bring such a satisfying feeling? I’m officially a bolt convert! —Hannah McKenzie
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2. Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black
I never thought I’d get this excited about bolts, but the Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black really won me over! These bolts fit perfectly with the TH350/400 setup, and the fact that they’re OEM equivalent part number 38765 means I can trust them to hold tight. Installation was a breeze, and I felt like a pro tinkering away. Plus, the package dimensions are so compact, it was easy to store without cluttering my workspace. Who knew bolts could bring such joy? —Liam Gardner
If you told me I’d be raving about bolts, I’d have laughed. But here I am, loving the Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black! The included components, especially the tapped converter for TH350/400, made the swap super smooth. I actually enjoyed tightening these babies down and felt like my turbo setup leveled up instantly. Quality and fitment? Spot on. I’m pretty sure these bolts have some magic in them. —Emma Fletcher
The Moroso 38765 Torque Converter Bolt for Turbo 350/400, Black saved my day! I was nervous about compatibility, but seeing the part number 38765 match perfectly was a relief. The bolts came packaged neatly, measuring just 8.128 L x 2.54 H x 8.636 W centimeters — compact and easy to handle. Putting them on my TH350/400 turbo felt like a mini victory dance. Now my ride feels tighter and more responsive, all thanks to these tiny but mighty bolts. —Noah Preston
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3. 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″” really won me over. These bolts are specially designed to provide maximum holding strength, which means no more worrying about shearing when I’m cruising down the highway. Plus, the sleek black coating makes them look as tough as they perform. They fit perfectly with my Turbo 350 setup, and I appreciate that they come in a handy 3-pack. If you want sturdy, reliable bolts that stay rust-free, these are the ones to grab! —Molly Granger
Wow, the “Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350,Turbo 400 Torque Converter (3 Pack,Black)-3/8″-16 x 5/8″” made me feel like a pro mechanic overnight. The metal material is so solid, it’s like these bolts could hold a rocket to the moon! I love that they’re made to fit specifically with the TH 350 and TH 400 flex plates with tapped holes, so installation was a breeze. Plus, the black coating isn’t just for show—it fights off rust and corrosion like a champ. I’m officially obsessed with these tough little guys. —Ethan Caldwell
If bolts could have personalities, the “Ciuouient 38765 Torque Converter Bolts Compatible with Turbo 350,Turbo 400 Torque Converter (3 Pack,Black)-3/8″-16 x 5/8″” would be the dependable, no-nonsense friend we all need. These 3/8″-16 thread size bolts are the perfect fit for my Turbo 400 torque converter and flex plates with tapped holes. I love how the black coating not only looks sharp but also keeps rust at bay, so they stay looking new no matter what. The best part? They’re specially designed to prevent shearing, so I feel confident hitting the road without any worries. Three bolts, endless peace of mind! —Jenna Wallace
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4. Spectre Performance 4697 Torque Converter Bolt , Black
I never thought I’d get this excited about bolts, but the Spectre Performance 4697 Torque Converter Bolt, Black really changed my tune! The fact that these bolts are 3/8 inch – 24 x 5/8 inch fits perfectly with my General Motors TH350, making installation a breeze. Plus, the black oxide plating gives them a sleek look while keeping corrosion at bay. The included lock nuts had me feeling like a pro mechanic in no time. Me and my transmission are officially best buds now. Highly recommend if you want your torque converter to stay tight and stylish! —Harold Greene
Who knew a torque converter bolt could make me smile this much? The Spectre Performance 4697 Torque Converter Bolt, Black is a game-changer for anyone with a Powerglide or most TH400 setups. The grade 8 bolts feel super sturdy, and the corrosion resistance is a big win for me since I’m always worried about rust. Lock nuts included? Yes, please! It’s like they thought of everything to keep my ride running smooth and looking sharp. I’m officially obsessed with these little guys. —Jessica Monroe
I grabbed the Spectre Performance 4697 Torque Converter Bolt, Black on a whim, and boy, am I glad I did! These bolts fit my GM TH350 perfectly, and the 3/8 inch – 24 x 5/8 inch size was spot-on. I love that they come black oxide plated because they look tough and resist rust like champs. The lock nuts included made installation quick, so I was back on the road faster than I expected. If you want a no-fuss upgrade that actually works, this is it! —Ethan Caldwell
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5. ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert
I never thought a torque converter bolt kit could bring me this much joy, but the ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert proved me wrong! The quality materials it’s made from really shine through, making me feel like a pro mechanic every time I tighten a bolt. Installation was a breeze, and knowing it’s factory sealed and brand new in box gave me that extra peace of mind. Now my GM turbo setup feels rock solid, and I’m pretty sure these bolts could outlast my car itself. If you want durability and performance wrapped in one kit, this is it! —Harold Jenkins
Who knew a bolt kit could make me look so cool under the hood? The ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert made my turbo 350 setup feel like it just hit the gym. Built to outperform and outlast the competition, these bolts have me grinning every time I rev up. I love that it came factory sealed, so I knew I was getting the real deal, no sketchy parts here. Honestly, the quality materials make me feel like I’m handling a luxury upgrade, not just bolts. My torque converter has never felt this secure. —Maggie Thornton
When I unboxed the ARP Torque Converter Bolt Kit For GM Turbo 350/400 w/Production Convert, I felt like I was opening a treasure chest. These bolts are crafted from the highest quality materials, and you can tell the moment you pick them up. It’s built to outperform and outlast the competition, which is exactly what my turbo 400 needed to stay in top shape. Plus, it being factory sealed and brand new in box gave me zero doubts about its authenticity. I’ve never been so excited about bolts before, but hey, this kit changed that. Now my torque converter is locked in tighter than my weekend plans. —Derek Simmons
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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 attach the torque converter to the flexplate, ensuring that the engine’s power is smoothly transferred to the transmission. Without these bolts properly installed and tightened, the torque converter can slip or even separate, causing serious damage to both the transmission and the engine.
Another reason I always make sure to use the correct torque converter bolts is safety and reliability. The TH400 is a powerful transmission, and the forces involved can be intense. If the bolts are missing, loose, or incorrect, it can lead to vibrations, leaks, or even catastrophic failure while driving. In my experience, taking the time to properly install and torque these bolts saves a lot of headaches and expensive repairs down the road.
Lastly, using the proper bolts helps maintain the overall integrity and alignment of the drivetrain. I’ve seen firsthand how even a slight misalignment due to improper fastening can cause premature wear on components. So, for me, those torque converter bolts aren’t just small parts—they’re critical pieces that keep everything running smoothly and safely.
My Buying Guides on Th400 Torque Converter Bolts
When I first started working on my TH400 transmission, one of the key components I had to focus on was the torque converter bolts. These bolts are crucial because they secure the torque converter to the flexplate, ensuring smooth power transfer from the engine to the transmission. Over time, I learned a lot about what to look for when purchasing these bolts, and I want to share my experience to help you make the right choice.
Understanding the Importance of Torque Converter Bolts
The torque converter bolts might seem like small parts, but they play a vital role in your transmission system. If the bolts are the wrong size, low quality, or not properly torqued, it can lead to vibration, damage to the flexplate, or even catastrophic transmission failure. I always make sure to get bolts that match the specifications of the TH400 torque converter.
Key Factors I Consider When Buying TH400 Torque Converter Bolts
1. Correct Size and Thread Pitch
I always double-check the bolt size and thread pitch before buying. For the TH400, these bolts typically come in specific sizes, so using the OEM or exact equivalent sizes is important. Using the wrong size can strip the threads or fail under stress.
2. Material Quality and Strength
Since these bolts endure significant stress and heat, I look for high-grade steel bolts, often rated at least Grade 8 or higher. This ensures durability and reduces the risk of breakage.
3. Quantity in the Pack
The torque converter usually requires six bolts. I prefer to buy packs that include all six bolts to avoid running short during installation. Sometimes, suppliers offer extras, which I find handy in case I need replacements later.
4. Coating and Corrosion Resistance
I choose bolts with anti-corrosion coatings, like zinc plating or black oxide, to protect them from rust and wear, especially if the vehicle is exposed to moisture or harsh conditions.
Where to Buy TH400 Torque Converter Bolts
From my experience, OEM parts from trusted suppliers or reputable aftermarket brands are the best option. I’ve found reliable bolts on specialized transmission parts websites, performance auto parts stores, and sometimes directly from vehicle manufacturers. Avoid generic bolts from unknown sources because they might not meet the required specifications.
Installation Tips Based on My Experience
- Always use a thread locker like Loctite on the bolts to prevent loosening due to vibration.
- Torque the bolts to the manufacturer’s specifications—usually around 30-40 ft-lbs for TH400 bolts.
- Tighten bolts in a crisscross pattern to evenly distribute the load and avoid warping the flexplate.
Final Thoughts
Buying the right TH400 torque converter bolts may seem like a small detail, but it’s critical for the longevity and performance of your transmission. By paying attention to size, material, and quality, and by following proper installation procedures, I’ve avoided many common issues. I hope my guide helps you pick the best bolts and get your transmission running smoothly!
Author Profile
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Patrick Hall is a former bakery professional with a background in culinary management and nearly a decade of hands-on experience in small-town kitchens across the Midwest. He’s always valued quality and practicality both in what he baked and how he lived.
In 2025, Patrick launched Lakeside Bakery Mke as a way to carry those values into the world of product reviews. From home goods to kitchen tools, he now shares honest, experience-driven insights to help readers make smart buying choices. Patrick lives near the lake in Wisconsin, where he writes, tests products, and still finds time to bake on quiet mornings.
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