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Description
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve KitThe 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
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+ Chevrolet/GMC 6.6L Duramax. Our CNC-machined aluminum thermal bypass valve not only looks better than the stock unit, but it performs better too. This Mishimoto thermal bypass valve kit includes a fully serviceable thermostat for fast warm-up in cold climates. This kit also includes a thermostat bypass 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. This 2017+ Chevrolet/GMC 6.6L Duramax L5P Thermal Bypass Valve Kit is built to last a lifetime with a durable black anodized finish and our Mishimoto Lifetime Warranty.This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021 | Chevrolet | Silverado 2500 HD | Custom |
| 2017-2021 | Chevrolet | Silverado 2500 HD | High Country |
| 2017-2021 | Chevrolet | Silverado 2500 HD | LT |
| 2017-2021 | Chevrolet | Silverado 2500 HD | LTZ |
| 2017-2021 | Chevrolet | Silverado 2500 HD | WT |
| 2017-2021 | Chevrolet | Silverado 3500 HD | High Country |
| 2017-2021 | Chevrolet | Silverado 3500 HD | LT |
| 2017-2021 | Chevrolet | Silverado 3500 HD | LTZ |
| 2017-2021 | Chevrolet | Silverado 3500 HD | WT |
| 2020-2021 | GMC | Sierra 2500 HD | AT4 |
| 2017-2021 | GMC | Sierra 2500 HD | Base |
| 2017-2021 | GMC | Sierra 2500 HD | Denali |
| 2017-2021 | GMC | Sierra 2500 HD | SLE |
| 2017-2021 | GMC | Sierra 2500 HD | SLT |
| 2020-2021 | GMC | Sierra 3500 HD | AT4 |
| 2017-2021 | GMC | Sierra 3500 HD | Base |
| 2017-2021 | GMC | Sierra 3500 HD | Denali |
| 2017-2021 | GMC | Sierra 3500 HD | SLE |
| 2017-2021 | GMC | Sierra 3500 HD | SLT |
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 27 reviews
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Product Reviews
★★★★★ 5
The Biggest Visible Change I’ve Seen in My Skin in Years
Color: Zero Pore Pads, Size: 70 Count (Pack of 1), Color: Zero Pore Pads, Size: 70 Count (Pack of 1)
If I could only keep one skincare product, it would honestly be these pads.
Even after trying peels, tools, clay masks, exfoliants, and retinol, this is the most noticeable improvement I’ve seen in my skin.
I’m in my 50s and have tried a lot of skincare over the years — pore strips, clay masks, exfoliants, retinol, you name it. Very few products have made a noticeable difference in my skin, but these absolutely have.
My biggest concern has always been the pores on my nose. They’ve looked enlarged for years and it’s something I’ve been self-conscious about. After using these pads, the difference was surprisingly visible — my pores looked tighter, my skin texture smoother, and my nose looked noticeably clearer.
I added a close-up photo because this is where I’ve seen the biggest difference — my pores look visibly tighter and clearer
What impressed me most is that I saw improvement right away, but the results actually kept getting better with consistent use. After about a month, my skin looks more refined overall and my nose pores appear much smaller than they used to.
I also have sensitive, combination skin, so I’m careful with exfoliating products. These have been very gentle for me. The pads are thin but well saturated (not dripping), and I like using the textured side first to exfoliate, then flipping to the smooth side to finish. There’s no strong fragrance and they haven’t irritated my skin.
Another unexpected benefit is how much better my makeup applies now. Foundation sits more smoothly and doesn’t settle into my pores the way it used to.
After years of trying different skincare products, this may honestly be the one that has made the most noticeable change in my skin.
If enlarged pores on your nose bother you like they did me, this product is absolutely worth trying.
This is one of the few products that has genuinely shocked me with how well it works! I’ve been telling everyone I know and I’m not a spokesperson! I’m just impressed and happy to find something that works so well! 🩵
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Truly zero pores!
Color: Zero Pore Pads, Size: 70 Count (Pack of 1)
These toner pads are a really convenient way to incorporate gentle exfoliation into a daily routine without adding extra steps. The dual-textured design is great—the textured side helps lightly exfoliate, while the smoother side is nice for refining and prepping the skin. They feel effective without being overly harsh. With consistent use, my skin looks a bit smoother and more refined, especially in areas where pores tend to be more visible. The formula feels active, but still balanced enough for regular use if your skin tolerates exfoliating acids well.
I also appreciate how easy they are to use—pre-soaked and mess-free, which makes them ideal for both morning or evening routines. Overall, a well-formulated, easy-to-use option for maintaining smoother, clearer-looking skin with minimal effort.
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Perfect
Color: Black
The Lamicall Car Headrest Tablet Holder (3-in-1 Extendable) is exactly the adulting hack I didn’t know I needed until now. If you’ve ever tried to hold a tablet for a kid on a long ride and felt your arm turn into jelly, this thing is your escape plan.
Setup is painless. It snaps onto the headrest in seconds and stays put like it actually wants to work. No wrestling with screws or an instruction manual written in ancient hieroglyphs.
Stability is legit. Once the tablet is locked in, it doesn’t wobble, jiggle, or threaten to fall — even when someone in the backseat is basically auditioning for an earthquake simulation. That peace of mind alone makes this worth it.
The 3-in-1 extendable design is slick. Adjust it for different viewing angles and distances so everyone (yes, even the seatmate who insists on leaning sideways) gets a great view. Landscape? Portrait? Gaming? Movie time? Covered.
Build quality feels solid and durable, not like something that’ll snap after a few uses. It works with a range of tablet sizes too, so you aren’t limited to one device.
Overall, this holder just works exactly how you want it to. Five stars because it’s practical, sturdy, and actually makes life easier — especially when peace in the backseat is on the line.
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Reviewed in the United States on January 10, 2026
★★★★★ 5
perfect for road trips
Color: Black
my sister lives 3 hours away, and being that i usually travel by myself with 2 small children, it's sometimes hard to keep them entertained for the trip. my husband bought this for me to keep in my car in case i need it and it has absolutely come in handy a few times. it's super sturdy, it fits perfectly behind my seat without taking up too much space or making my daughter feel cramped. it's challenging to use while driving when it's directly behind you but it does swivel close enough that you're able to do some things on the screen. however it does make it SUPER simple when you're in the passenger seat.
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Reviewed in the United States on April 22, 2026
★★★★★ 5
Used for 3 years, buying again!
Color: Black
Bought 2 of these 3 years ago. One of them just broke (a crucial plastic piece snapped so not fixable). But with the low price and the countless road trips we’ve used these on I feel I’ve gotten my moneys worth. Purchasing again. 5 stars.
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Reviewed in the United States on May 28, 2026
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