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Description
Mishimoto Transmission Thermal Bypass Valve Kit 17-19 GM 6.6L Duramax L5PAre you wanting the best performance out of your Transmission? The Allison transmission is the backbone of your L5P Duramax. It's responsible for transmitting large quantities of torque from your V8 diesel powerplant. This torque generates a lot of heat, and if that heat isn't dissipated, it can destroy your transmission. The transmission cooler does a good job of keeping trans fluid temperatures in check, but only if the fluid can reach it. The stock
Are you wanting the best performance out of your Transmission? The Allison transmission is the backbone of your L5P Duramax. It's
responsible for transmitting large quantities of torque from your V8
diesel powerplant. This torque generates a lot of heat, and if that heat
isn't dissipated, it can destroy your transmission. The transmission
cooler does a good job of keeping trans fluid temperatures in check, but
only if the fluid can reach it. The stock cooling system of the
Allison 1000 transmission utilizes an in-line thermal bypass valve that
controls fluid flow to the transmission cooler. The purpose of this
valve is to prevent transmission fluid from flowing to the cooler until
it reaches operating temperature. The thermostat inside this valve is
prone to failure, however, and when that happens, the fluid never flows
to the cooler, and the transmission can overheat. That's why Mishimoto
has developed a thermal bypass valve upgrade for your 2017-2019
Chevrolet/GMC 6.6L Duramax. The Mishimoto thermal bypass valve features strategically machined internal passages, providing improved flow over the stock valve for more effective cooling. In addition, cooling fins machined into the valve body add even more heat dissipation.
OPTIONAL THERMOSTAT DETAILS: This kit includes the removeable Thermostat that can be installed to
provide constant cooling in warm climates or for use in extreme
driving/towing conditions. The Mishimoto thermal bypass valve features
strategically machined internal passages, providing improved flow over
the stock valve for more effective cooling. In addition, cooling fins
machined into the valve body add even more heat dissipation.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 580 reviews
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Product Reviews
★★★★★ 4
As promised
Color: Dark Gray Seersucker, Size: Queen(90"x90")
Cooling as advertised. Only complaint is that most nights it slides off the bed because it is so silky.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Lightweight and soft
Color: Navy Blue Seersucker, Size: King(108"x90")
I purchased this as someone who is constantly waking up too hot with blankets, but too cold without. This comforter has been a game changer. I’m getting much better sleep, and while I still wake up a little too warm sometimes, it’s significantly less than I was previously.
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Reviewed in the United States on April 22, 2026
★★★★★ 5
ightweight Cooling Comforter That Actually Feels Good for Hot Nights
This seersucker cooling comforter has been a nice upgrade for warmer nights. It’s very lightweight and breathable, so it doesn’t feel heavy or trapping heat like a traditional comforter. The fabric has a soft, slightly silky feel, and the seersucker texture gives it a bit of airflow that helps it stay more comfortable.
The fit is good on a Twin size bed with enough drape over the sides without feeling oversized or bulky. It lays nicely on the bed and doesn’t bunch up easily, which makes it easy to straighten out in the morning.
Thickness-wise, it’s on the thinner side, which is actually what makes it work for hot sleepers. It’s not meant to be a heavy blanket and more of a light, breathable layer that still feels like a comforter. The reversible design is a nice touch too depending on which side you prefer.
Overall, it’s easy to use, lightweight, and comfortable for summer or warm sleepers. It feels like good value if you want something simple that helps cut down on overheating without overcomplicating things.
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Reviewed in the United States on April 17, 2026
★★★★★ 5
Cooling Blanket for Hot Sleepers, Soft Lightweight Comfort with a Cool-to-the-Touch Feel
This reversible cooling blanket is a great option for anyone who sleeps warm. It’s incredibly soft, very lightweight, and has that instantly cool-to-the-touch feel that makes it especially comfortable for hot sleepers.
What I liked most is how airy and breathable it feels without being heavy or stuffy. It’s comfortable enough to use all night and gives that nice cooling sensation when you first pull it over you. The softness also makes it feel cozy without sacrificing the lightweight design.
My only real wish is that it came with a matching pillowcase, because that would make it feel even more complete as a sleep set.
Pros:
Extremely soft and comfortable
Cool to the touch
Lightweight and airy feel
Great for hot sleepers
Breathable without feeling heavy
Cons:
Does not include a matching pillowcase
Verdict:
If you tend to sleep hot, this is a really nice lightweight cooling blanket. It’s soft, breathable, and comfortable with a refreshing cool feel. I just wish it included a pillowcase to make the set feel complete
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Reviewed in the United States on April 4, 2026
★★★★★ 4
Cool & comfy
Color: Dark Gray Seersucker, Size: King(108"x90")
Cool but not as cold as I wanted
Very soft and comfy though
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Reviewed in the United States on April 29, 2026