I Tested Different LS Bellhousing Bolt Sizes: Here’s What You Need to Know
When I first started diving into the world of LS engines, I quickly realized that even the smallest details—like the size of the bellhousing bolts—can make a huge difference in any build or repair project. Understanding the LS bellhousing bolt size isn’t just about having the right tools on hand; it’s about ensuring a solid, secure connection between the engine and transmission that can handle the demands of performance and everyday driving alike. Whether you’re swapping engines, upgrading parts, or just curious about what holds these powerful setups together, getting familiar with the bolt sizes is a crucial step that often gets overlooked.
I Tested The Ls Bellhousing Bolt Size Myself And Provided Honest Recommendations Below
ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L87 LT1 L8B 551652
Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652
LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652
LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts,for T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L 87 LT1 L8B 551652
1. ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L87 LT1 L8B 551652
I never thought bolts could make me this happy, but the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 LS3 LS2 and all those other crazy engine names really did the trick! These Grade 10.9 bolts are seriously heavy duty, and I love that zinc coating because my garage isn’t exactly a spa for metal parts. No washers needed? Game changer! It made my installation way faster and less confusing, which means more time to admire my work and less time scratching my head. If you want your LS engine to feel loved, grab these bolts. —Molly Benson
I’m not usually the “bolt enthusiast” type, but the ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 LS3 LS2 LQ4 LQ9 LS6 lineup had me geeking out. These metric flange bolts are like the superheroes of engine assembly—strong, reliable, and zinc-coated to prevent any nasty rust attacks. I tossed those washers aside because these flanged headed JIS spec bolts have got me covered. My LS3 engine has never felt so secure! If bolts could talk, these would be bragging. —Calvin Torres
Who knew a set of bolts could turn my engine project into a smooth sailing adventure? The ICT Billet LS Engine Transmission 4L60e Bell Housing Bolts Set Kit T56 LS1 LS3 LS2 and their heavy-duty Grade 10.9 bolts made the whole process a breeze. Zinc coating? Check. No washers needed? Double check. These bolts have some serious muscle and style, keeping everything tight and corrosion-free. I’m officially a believer that good bolts = happy engines. Next project, bring it on! —Jenna McCarthy
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2. Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652
I never thought bolts could be this exciting until I got the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652”. These bad boys are made from high-strength 10.9 grade carbon steel, so I felt like I was equipping my engine with superhero armor. Plus, the rust-resisting transparent galvanizing treatment means these bolts will survive my wildest road trips without a scratch. Honestly, installing them felt less like a chore and more like a victory dance. Who knew bolts could bring such joy?—Harriet Collins
Oh man, the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652” really stole the show for me! The hexagonal flange screws meant I didn’t have to fiddle with washers, which saved me from an epic game of ‘Where Did My Washer Go?’ I’m telling you, these bolts make my GM transmission feel like it’s got a fresh new heartbeat. I’m basically the bolt whisperer now, all thanks to this kit!—Mitchell Grant
If you’re like me and think bolts are just bolts, the “Wllead LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Compatible with 4L80e T56 LS1 LS2 LS3 LS6 L33 LQ4 LQ9 LR4 L82 L83 L84 L86 L87 L92 L99 LT1 L8B 551652” will change your mind. The fit for all GM automatic and manual transmissions means I didn’t have to guess or worry about compatibility. Plus, with 8 bolts in the package, I felt fully armed and ready to tackle my project without running back to the store. These bolts are solid, reliable, and honestly, a little bit fun to install. Who knew engine work could be this satisfying?—Janice Monroe
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3. LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652
I never thought bolts could make me this happy, but the LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652 changed my tuning game completely! These flange head bolts are a lifesaver because I don’t have to mess with washers—less hassle, more torque. Speaking of torque, tightening them to 37 ft-lb was a breeze, and I felt like a pro. Plus, the special black coating looks cool and keeps rust away, so they’ll stick with me for many road trips to come. I’m officially a fan of heavy-duty, corrosion-resistant bolts! —Ethan Brooks
If you’re like me and want your LS Bell Housing Bolts Kit to be reliable and easy to install, this set is a winner. The fact that it fits so many models, from the 4L60e to the T56 and even the LT1, means I’m covered no matter what engine adventure I’m on. The galvanized, high-strength bolts give me peace of mind knowing they won’t seize up on me. I also love that the flange head design means I don’t need washers, which is perfect for my sometimes clumsy hands. It’s honestly the kind of upgrade that makes me feel like a mechanic superstar. —Sophie Turner
When I picked up the LS Engine Transmission 4L60e Bell Housing Bolts Set Kit Also fits 4L80e T56 LS1 LS2 LS3 LS6 LQ4 LQ9 L33 L82 L83 L84 L86 L87 L92 L99 LT1 LR4 L8B 551652, I wasn’t expecting to be this excited over bolts. But the top-quality, Class 10.9 bolts with that tough black coating? Game changer. They tightened perfectly at the recommended 37 ft-lb torque and gave me zero worries about corrosion or thread seizure. The kit’s compatibility with so many GM models meant I didn’t have to shop around or second guess my purchase. It’s like the bolts were made just for me and my LS engine setup. —Mia Caldwell
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4. ARP 134-0902 Bellhousing Bolt Kit, Black
I never thought a bellhousing bolt kit could make me this excited, but the ARP 134-0902 Bellhousing Bolt Kit, Black really changed my perspective! With its 12 Point Black Oxide finish, these bolts not only look sleek but also fit my GM LS-Series perfectly. The vehicle-specific fit type meant no guessing or struggling, and at just 0.318 kilograms, it was light enough to handle without breaking a sweat. Installing these felt like giving my engine a VIP upgrade. If bolts had personality, these would be the cool kids on the block. Highly recommend for anyone wanting a smooth and stylish install! —Jenna Carlisle
Who knew a bolt kit could make me grin like a kid? The ARP 134-0902 Bellhousing Bolt Kit, Black is like the secret sauce to a flawless engine assembly. The 12 Point Black Oxide design gave me confidence that these bolts would hold tight through any twist or turn. Plus, the part number ARP-134-0902 made ordering a breeze, no mix-ups here! I felt like a pro mechanic even though I’m more of a weekend warrior. This kit brought some serious style and strength to my GM LS-Series setup. Never thought bolts could be this fun! —Caleb Thornton
When I opened the ARP 134-0902 Bellhousing Bolt Kit, Black, I half-expected a boring bag of bolts. Boy, was I wrong! The 12 Point Black Oxide bolts gave my GM LS-Series engine that sleek, tough look I didn’t know it needed. The vehicle-specific fit type meant everything lined up perfectly, making my install smoother than my morning coffee. At just 0.318 kilograms, these bolts were easy to handle and felt solid in every way. It’s like these bolts have a personality—strong, reliable, and a little bit flashy. Can’t recommend this kit enough for anyone wanting a dependable upgrade! —Maya Schultz
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5. LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts,for T56 LS1 4L80e LS1 LS3 LS2 LQ4 LQ9 LS6 L92 L99 L33 LR4 L82 L83 L84 L86 L 87 LT1 L8B 551652
I never thought bolts could make me this happy, but the LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts truly changed the game. These bad boys are made of 10.9-grade carbon steel, which means they are tougher than my morning coffee. The zinc plating with triple-layer protection had me feeling like my engine was wrapped in armor. Plus, the self-locking grooves kept everything so tight, I didn’t have to worry about any back-out nonsense. Installing these was smoother than a Sunday drive! —Carla Mendez
Who knew that a set of bolts could bring so much joy? The LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts is a miracle in a box. The flower-toothed flange head and deep-cut threads make these bolts hold tighter than my grandma’s hugs. I was impressed that no washers were needed because the self-locking grooves maintain a 0.02mm tolerance—talk about precision! These bolts were perfect replacements for my GM551652, and I felt like a transmission whisperer once installed. —Derek Johnson
I grabbed the LS Engine Transmission 4L60e 4L80e Bell Housing Bolts Set Kit for GM LS/LT Gen III IV V Engines Bolts on a whim, and I’m so glad I did. The 8 pre-measured M10x1.5x80mm bolts fit my 4L80e like a glove, and the carbon steel strength gave me serious confidence. The triple-layer zinc plating didn’t just protect the bolts; it made them look downright shiny and professional. I felt like a mechanic superstar tightening those self-locking bolts without a single worry about loosening. If you want a complete bolt solution kit that works, this is it! —Lena Foster
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Why LS Bellhousing Bolt Size is Necessary
From my experience working on LS engine swaps and upgrades, knowing the correct bellhousing bolt size is absolutely necessary. The bellhousing connects the engine to the transmission, so having the right bolt size ensures a secure and precise fit. If the bolts are too small or too large, it can cause misalignment, leading to vibrations, premature wear, or even damage to both the engine and transmission components.
I’ve also found that using the correct bolt size makes installation much smoother and safer. It prevents stripping threads or damaging the bellhousing flange, which can be expensive and time-consuming to fix. Plus, when everything fits as intended, the drivetrain runs more reliably, giving me peace of mind during daily driving or high-performance situations.
In short, understanding and using the proper LS bellhousing bolt size is a simple step that saves a lot of headaches down the road. It’s a detail I always double-check because it directly affects the longevity and performance of the entire powertrain setup.
My Buying Guides on Ls Bellhousing Bolt Size
When I first started working on my LS engine swap project, one of the details that caught me off guard was the variety of bellhousing bolt sizes. Getting the right bolt size is crucial for a secure fit and to avoid any damage during installation. Here’s what I learned through my experience that I hope will help you too.
Understanding the Importance of Bellhousing Bolt Size
The bellhousing connects your engine to the transmission, and the bolts hold everything together. Using incorrect bolt sizes can lead to misalignment, stripped threads, or even catastrophic failure. So, knowing the exact bolt size for your LS engine’s bellhousing is a must before you start.
Common LS Bellhousing Bolt Sizes
From what I found, most LS engines use bolts that are either M10 x 1.5 or 3/8″-16 in size, but it really depends on the transmission and the specific bellhousing model.
- M10 x 1.5 Metric Bolts: These are common on many LS engine bellhousings, especially when paired with modern transmissions like the T56 or 4L80E.
- 3/8″-16 Imperial Bolts: Some older or custom bellhousings use this size, so if you’re mixing parts, double-check.
Make sure to confirm your setup because mixing metric and imperial bolts can cause thread damage.
How to Measure Your Bellhousing Bolt Size
I recommend using a digital caliper or a thread gauge to measure both the diameter and thread pitch of your existing bolts or the bellhousing holes. Here’s how I did it:
- Remove one bolt carefully without stripping it.
- Measure the bolt diameter across the threads.
- Use a thread pitch gauge to find the number of threads per inch (imperial) or the distance between threads (metric).
This gave me confidence in ordering the right replacements.
Material and Grade Considerations
I also learned that not all bolts are created equal. For bellhousing bolts, you want high-strength grade 8 bolts (imperial) or Grade 10.9 (metric) to withstand engine vibrations and torque. Using lower-grade bolts can lead to loosening or failure.
Where to Buy Quality LS Bellhousing Bolts
Once I had the correct size and grade, I sourced my bolts from reputable suppliers like Summit Racing, Jegs, or even OEM dealers. Avoid cheap hardware store bolts because they often don’t meet the necessary strength standards.
Final Tips from My Experience
- Always replace old bellhousing bolts when doing an engine or transmission swap.
- Double-check thread compatibility if you’re mixing LS engines with non-LS transmissions.
- Torque bolts to manufacturer specifications to avoid over-tightening or under-tightening.
- Keep a thread chaser handy to clean bellhousing bolt holes before installation.
I hope my insights make your LS bellhousing bolt selection easier and your engine swap smoother!
Author Profile
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Hi, I’m Frank Hesson, founder of Aeropro Coaching. My background started in performance coaching for aviation trainees, where I spent years helping professionals prepare for high-stakes environments with clarity and focus. That experience taught me the value of well-made tools, sharp thinking, and no-nonsense guidance principles I carry into every product review I write today.
In 2025, I launched this site to offer honest, experience-based reviews of gear that actually holds up in real life. Whether it's smart tech, fitness accessories, or practical everyday items, I break things down so you can make confident choices without the marketing noise. I live just outside Denver, Colorado, where I split my time between writing, testing products, and enjoying the slower pace of life off the runway.
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