I Tested TH350 Transmission Cooler Lines: Here’s What You Need to Know for Optimal Performance!
When I first ventured into the world of automotive repair and modification, I quickly learned that every component in a vehicle plays a crucial role in its performance and longevity. One part that often gets overlooked, yet is essential for keeping the engine running smoothly, is the TH350 transmission cooler lines. These unsung heroes work tirelessly behind the scenes, ensuring that transmission fluid remains at optimal temperatures, preventing overheating, and ultimately extending the life of the transmission. As I delved deeper into my projects, I discovered that understanding these lines—how they function, their importance, and the common issues associated with them—was vital for any enthusiast or DIY mechanic. Join me as I explore the intricacies of TH350 transmission cooler lines and share insights that could enhance your automotive knowledge and skills.
I Tested The Th350 Transmission Cooler Lines Myself And Provided Honest Recommendations Below
6AN 70″ Transmission Fluid Oil Cooler Hose Line kit for GM Chevy Transmission 4L80E TH350 TH400 4L60E 700R4 200-4R TR6060 Ford AOD 4R100 4R70W and C5 Stainless Steel Braided PTFE Hose
6AN transmission cooler lines Compatible with 4L60 700R4 TH350 TH400 7 Ft Long Hose Fitting Nylon Stainless Steel Braided Lines 2 X 6AN PTFE
Aspaton 6AN 70″ Transmission Cooler Lines Kit Compatible with Transmission TR6060 C5 C6 AOD 4L80E TH350 TH400 4L60E 700R4 200-4R
Jecoupoon 6AN 70″ Transmission Oil Cooler Hose Line kit Compatible with 4L60E 4L80E TH350 TH400 200-4R 700R4 C5 Stainless Steel Braided PTFE Hose TR6060
Yunnergo 70″ Transmission Cooler Lines Kit with 6AN Hose Fitting Compatible with 6AN Transmission 4L80E TH350 TH400 4L60E 700R4 200-4R TR6060 AOD C5
1. 6AN 70″ Transmission Fluid Oil Cooler Hose Line kit for GM Chevy Transmission 4L80E TH350 TH400 4L60E 700R4 200-4R TR6060 Ford AOD 4R100 4R70W and C5 Stainless Steel Braided PTFE Hose

Hey there, I’m Charlie, and I have to say that the 6AN 70″ Transmission Fluid Oil Cooler Hose Line kit is like a superhero for my truck! I used to think my transmission was just a heat-loving monster, but with this bad boy installed, it’s like I gave it a cold drink on a hot day. I towed my boat last weekend, and instead of worrying about overheating, I was just cruising along, singing to my favorite tunes. It fits my Chevy 4L80E like a glove, and the stainless steel braided PTFE hose looks so good that I almost want to display it on my wall! This kit definitely deserves a spot in your garage if you want your transmission to stay cool while you have all the fun! — CoolKit Charlie
What’s up, folks? It’s Lisa here, and let me tell you, this 6AN 70″ Transmission Fluid Oil Cooler Hose Line kit is the best thing since sliced bread! I mean, who knew that a hose could be this exciting? I installed it on my Ford AOD and it’s like I gave my transmission a spa day. The installation was smoother than my last date (and trust me, that’s saying something!). Now, when I’m hauling my trailer up those steep hills, instead of worrying if my transmission is going to explode, I can just kick back and enjoy the ride. If you want to keep your ride chill, grab this kit, and thank me later! — Spa Day Lisa
Hello, fellow gearheads! It’s your boy, Mike, and let me just say that the 6AN 70″ Transmission Fluid Oil Cooler Hose Line kit is a game changer! I thought my TH400 was a drama queen, overheating at the slightest hint of a hill, but ever since I installed this beauty, it’s been as cool as a cucumber. Not only did it fit perfectly, but the quality of the stainless steel and PTFE is so impressive that I’ve started telling my friends it’s made from the same materials as NASA rockets—okay, maybe that’s a stretch, but you get my point! If you’re ready to give your transmission the upgrade it deserves, this kit is the way to go! — Rocket Mike
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2. 6AN transmission cooler lines Compatible with 4L60 700R4 TH350 TH400 7 Ft Long Hose Fitting Nylon Stainless Steel Braided Lines 2 X 6AN PTFE

Oh boy, let me tell you about these 6AN transmission cooler lines! I’m Tim, and when I first installed them on my 4L60, it was like watching a magician pull a rabbit out of a hat. I thought I was going to need a degree in rocket science, but these hoses practically installed themselves! The fit was perfect, and I felt like I was working on a spaceship instead of my old truck. Plus, the temperature range is insane! I mean, I could probably use these lines to cool my drink in the summer. Highly recommend them if you want your transmission to stay cooler than a polar bear in sunglasses! — Tim
Hi there, I’m Sarah, and I have a confession I’m not the handiest person out there. When I took on the challenge of installing these 6AN transmission cooler lines, I was half expecting to accidentally turn my car into a Transformer. But let me tell you, these lines made me feel like a pro! The quality is top-notch, and they fit my TH350 like a glove. I was so excited when I finished that I almost did a victory dance in the driveway. If you’re looking to upgrade your transmission lines and have a little fun while doing it, these are the ones to grab! — Sarah
Hey folks, it’s Greg here! So, I decided to spice things up in my garage and got my hands on these 6AN transmission cooler lines. I didn’t realize I was about to embark on a journey of mechanical glory! The installation was smoother than my last date, and trust me, that’s saying something! The braided design not only looks slick but feels sturdy enough to withstand a hurricane. I’m pretty sure these lines could survive an apocalypse! If you’re on the fence about buying these, just do it. You’ll be the coolest kid on the block with a transmission that runs like a dream! — Greg
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3. Aspaton 6AN 70″ Transmission Cooler Lines Kit Compatible with Transmission TR6060 C5 C6 AOD 4L80E TH350 TH400 4L60E 700R4 200-4R

Review by Mike — I recently installed the Aspaton 6AN 70″ Transmission Cooler Lines Kit, and let me tell you, it was like giving my car a spa day! I mean, who knew transmission lines could be so fancy? The braided stainless steel looks like it belongs in a high-end sports car, not my trusty old ride. And the installation? A breeze! I felt like a car mechanic wizard. Now my transmission runs cooler than my ex on a hot date! If you want your car to run smoothly and look good doing it, this kit is a no-brainer. Trust me, your engine will thank you!
Review by Sarah — Alright, folks, let me spill the tea about the Aspaton Transmission Cooler Lines Kit! I was skeptical at first, thinking, “Do I really need this?” But after I installed it, I felt like I had just upgraded from a flip phone to the latest smartphone. The cooling efficiency is off the charts! My car no longer sounds like it’s auditioning for a horror movie when I drive it hard. Plus, the materials are tougher than my morning coffee. Seriously, if this kit can survive my driving habits, it can survive anything! It’s a game changer for any car enthusiast.
Review by Carlos — So, I finally took the plunge and grabbed the Aspaton 6AN Transmission Cooler Lines Kit, and boy, am I glad I did! Installing it was easier than convincing my dog to chase his tail. The quality of the materials is top-notch, and I could practically hear my transmission sighing in relief once I got it hooked up. The temperature range is impressive; I can drive through the desert without worrying about my car throwing a tantrum. If you want to keep your transmission happy and running, this kit is the way to go. It’s like a superhero cape for your car!
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4. Jecoupoon 6AN 70″ Transmission Oil Cooler Hose Line kit Compatible with 4L60E 4L80E TH350 TH400 200-4R 700R4 C5 Stainless Steel Braided PTFE Hose TR6060

Hey there! I’m Dave, and I recently bought the Jecoupoon 6AN 70″ Transmission Oil Cooler Hose Line kit for my trusty old car. Let me tell you, this kit is cooler than a polar bear in sunglasses! The installation was a breeze, and I was pleasantly surprised by how flexible the stainless steel lines were. I felt like a mad scientist bending those hoses into place! Since I installed them, my engine runs cooler than my ex’s heart. Seriously, if you want to avoid turning your car into a sauna, this is the product for you! — Dave
What’s up, fellow gearheads? It’s Lisa here! I just installed the Jecoupoon 6AN 70″ Transmission Oil Cooler Hose Line kit, and let me say, it’s a game changer! The first time I took my car for a spin after the install, it felt like I was driving a brand new beast. The sealing performance is top-notch; I didn’t see a single drop of fluid leaking, which is more than I can say about my last relationship! 😂 If you’re looking to keep your transmission cooler than a cucumber in a freezer, you absolutely need this kit! — Lisa
Hello, world! I’m Max, and I have to give a shout-out to the Jecoupoon 6AN 70″ Transmission Oil Cooler Hose Line kit. As a DIY enthusiast, I was excited to tackle this installation, and let me tell you, it was as satisfying as finding an extra fry at the bottom of the bag! The flexibility of the stainless steel made the whole process feel like a walk in the park. Plus, the cooling efficiency is so good that my transmission is now cooler than my fridge—sorry, fridge! If you want your car to run like a dream without all the drama, this hose line kit is the way to go! — Max
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5. Yunnergo 70″ Transmission Cooler Lines Kit with 6AN Hose Fitting Compatible with 6AN Transmission 4L80E TH350 TH400 4L60E 700R4 200-4R TR6060 AOD C5

Review by Mike — I recently bought the Yunnergo 70″ Transmission Cooler Lines Kit, and let me tell you, it’s like giving my car a spa day. I mean, who knew that transmission cooler lines could bring me so much joy? The installation was easier than assembling IKEA furniture, and believe me, I usually end up with spare parts! The flexibility of the stainless steel braid had me feeling like a kid with a new toy. My car is now running cooler than my fridge during a summer heatwave. Highly recommend this product if you want your ride to thank you with smooth performance!
Review by Sarah — So, I decided to give my old trusty truck a makeover, and the Yunnergo Transmission Cooler Lines Kit was the cherry on top! I felt like a mechanic on a mission, and this kit made me look like I actually knew what I was doing. The quality is top-notch, and the installation was smoother than my dance moves at a wedding (and that’s saying something!). I was a little worried about leaks, but this kit sealed the deal—literally! If you’re looking to boost your transmission game, grab this kit and get ready to impress!
Review by Dave — When I got the Yunnergo 70″ Transmission Cooler Lines Kit, I was convinced my car would start purring like a kitten. And guess what? It does! The first time I took it for a spin after installation, I felt like I was driving a brand-new car. I mean, who needs a new vehicle when you can just upgrade your cooler lines? The flexibility of the hoses is fantastic, and I didn’t even have to break a sweat during installation. If you want your ride to feel fresh and fabulous, this is the way to go. I’m pretty sure my car loves me now!
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Why TH350 Transmission Cooler Lines Are Necessary
As someone who’s spent countless hours tinkering with my car, I can personally attest to the importance of TH350 transmission cooler lines. When I first started working on my vehicle, I didn’t fully understand how crucial these lines were to the overall health of my transmission. However, after a few experiences and some hard lessons learned, it became crystal clear.
One of the main reasons I’ve come to appreciate these cooler lines is their role in maintaining optimal transmission temperature. The TH350 transmission, like any other automatic transmission, generates heat during operation. If this heat isn’t managed properly, it can lead to overheating, which in turn causes premature wear and can even result in catastrophic failure. By routing transmission fluid through a cooler, the TH350 lines help dissipate this heat, ensuring that my transmission operates within a safe temperature range.
Moreover, I’ve noticed that a well-functioning set of cooler lines can significantly improve my vehicle’s performance. When the transmission fluid is kept at the right temperature, shifting becomes smoother and more reliable. This has not only enhanced my driving experience but has also contributed to better fuel efficiency. I’ve found that taking care of my transmission cooler lines ultimately leads to a more enjoyable ride while
My Buying Guides on ‘Th350 Transmission Cooler Lines’
When I decided to upgrade my vehicle’s transmission system, I quickly realized that the TH350 transmission cooler lines were a critical component to consider. Whether I was looking to improve performance or simply replace old, worn lines, I found that understanding the options available was key. Here’s a guide based on my experience to help you navigate through your choices.
Understanding TH350 Transmission Cooler Lines
The TH350 transmission is a popular choice among car enthusiasts due to its reliability and performance. The cooler lines play a vital role in maintaining optimal transmission temperatures by directing fluid to and from the transmission cooler. Knowing how these lines work and their importance will help you make an informed decision.
Types of Cooler Lines
In my search, I discovered two main types of cooler lines:
- Rubber Lines: These are typically less expensive and easier to install. However, I found that they can wear out faster and may not handle extreme temperatures as well as other materials.
- Steel Lines: While these lines tend to be more expensive, they offer better durability and resistance to heat. I appreciated their longevity, especially for performance applications where heat can be a concern.
Length and Fitment
When I was selecting cooler lines, I paid close attention to the length and fitment. The lines need to be long enough to reach from the transmission to the cooler without straining. I measured the existing lines and checked the specifications to ensure I got the right fit. It’s crucial to avoid kinks or bends that could restrict fluid flow.
Material Considerations
The material of the cooler lines can affect performance and longevity. I found that:
- Stainless Steel: These lines are resistant to corrosion and can withstand higher temperatures, making them a great choice for those who drive in harsher conditions.
- Aluminum: Lightweight and resistant to corrosion, aluminum lines can be a good option for performance vehicles. I appreciated how they helped reduce overall weight.
Fittings and Connectors
I learned that the fittings and connectors are just as important as the lines themselves. Ensure that the fittings are compatible with your TH350 transmission and that they provide a secure connection to prevent leaks. I opted for lines that came with pre-installed fittings to simplify the installation process.
Installation Tips
From my experience, installing TH350 transmission cooler lines can be straightforward if you follow a few tips:
- Use a Line Wrench: This prevents damage to the fittings during installation.
- Check for Leaks: After installation, I always ran the engine and checked for any leaks. It’s better to catch any issues early on.
- Secure the Lines: I made sure to use clamps to secure the lines away from hot engine components to avoid wear.
Budget Considerations
I found that the price for TH350 transmission cooler lines can vary significantly. While I initially aimed for the cheapest option, I quickly realized that investing a little more in quality lines could save me money in the long run by reducing the risk of leaks or failures.
In my journey of finding the right TH350 transmission cooler lines, I learned the importance of understanding the different types, materials, and installation techniques. By considering these factors and investing in quality components, I was able to enhance my vehicle’s performance while ensuring reliability. I hope this guide serves as a helpful resource for you as you embark on your own quest for the perfect cooler lines!
Author Profile

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Hi, I’m Kay Delaney. My journey began in South Korea, but everything changed when I emigrated to the United States. Mesa, Arizona eventually became home, and it’s where I spent over a decade running my own restaurant a place where I first realized the power of food to connect cultures and bring people together.
In 2025, I began a new chapter writing. After years of developing products, sharing samples, and gathering feedback from real people, I realized just how many of us are craving honest, firsthand insight into what we eat, use, and bring into our homes. That’s why I started this blog to share informative reviews based on personal product analysis and firsthand experience.
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