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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 full-flow thermal bypass valve upgrade for your 2017-2019 Chevrolet/GMC 6.6L Duramax. Our CNC-machined aluminum full-flow thermal bypass valve not only looks better than the stock unit, but it performs better too. This Mishimoto thermal bypass valve eliminates the internal thermostat, providing full fluid flow to the transmission cooler in all running conditions. This setup is ideal for owners in warm climates, those performing heavy towing, and trucks needing the best possible cooling efficiency for their transmission. 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 adds even more heat dissipation. This 2017-2019 Chevrolet/GMC 6.6L Duramax L5P Full-Flow 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 |
|---|---|---|---|
| 2017-2019 | Chevrolet | Silverado 2500 HD | High Country |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LT |
| 2017-2019 | Chevrolet | Silverado 2500 HD | LTZ |
| 2017-2019 | Chevrolet | Silverado 2500 HD | WT |
| 2017-2019 | Chevrolet | Silverado 3500 HD | High Country |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LT |
| 2017-2019 | Chevrolet | Silverado 3500 HD | LTZ |
| 2017-2019 | Chevrolet | Silverado 3500 HD | WT |
| 2017-2019 | GMC | Sierra 2500 HD | Base |
| 2017-2019 | GMC | Sierra 2500 HD | Denali |
| 2017-2019 | GMC | Sierra 2500 HD | SLE |
| 2017-2019 | GMC | Sierra 2500 HD | SLT |
| 2017-2019 | GMC | Sierra 3500 HD | Base |
| 2017-2019 | GMC | Sierra 3500 HD | Denali |
| 2017-2019 | GMC | Sierra 3500 HD | SLE |
| 2017-2019 | GMC | Sierra 3500 HD | SLT |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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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
4.1 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 1
Failed Shortly After Purchase and Required Too Much Effort to Resolve
This product was purchased as a holiday gift for my spouse. Out of the box the product made a load mechanical noise (similar to a baseball card in bicycle spokes) – but it produced a nice heated frothed milk. Less than 3 months after first using the frother, it completely stopped frothing. The heating unit continued to work but the spinning disk did not move.
I contacted the seller and within 48 hours they requested a video of proof that the frother was no longer working. I provided the requested video 6 hours after receipt of seller's request. Since then, I have not received any communications, and my follow up emails receive NO RESPONSE.
Amazon should consider pulling this product and seller from their website.
UPDATE:
After multiple follow-up contacts over a month's time, manufacturer eventually issued a full refund.
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Reviewed in the United States on April 20, 2026
★★★★★ 4
Total game changer
Great frother. Nice capacity for a lot of foam. I've had it for a couple months. It's started out pretty quiet for about a month but I've noticed that the motor seems to be a little louder than usual but still a low sound. Not a big deal though. It works great.
Just wanted to mention that the quality of milk matters. For example, I shop at Aldi and I get their oat milk. It doesn't froth as good as a higher quality name brand oat milk. Lower quality almond milk won't hardly froth at all. Get a high quality almond milk. Whole milk and 2% does great. I love the fact that I can warm my milk in case I want a hot matcha latte which I have often or golden milk. I also want to mention that I also use flavored creamer which makes a nice foam. Cold or hot
This machine is a space saver. Easy to use. Easy to clean. You get two frothing elements which can be cleverly hidden under the frother when not in use. I use this almost every day. I really recommend this frother. It's a game changer
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Reviewed in the United States on February 6, 2026
★★★★★ 5
One of My Most Used Kitchen Appliances
I've been using this milk frother almost every day, and it's become one of my favorite kitchen appliances.
I originally purchased it because I wanted an easy way to make coffee shop-style drinks at home instead of spending money on coffee runs. It works great for both hot and cold foam, so I use it year-round for everything from hot coffee to iced coffee.
The foam comes out smooth and creamy, and it's made a noticeable difference in my homemade drinks. I also like that it's simple to use and easy to clean after each use.
If you enjoy lattes, iced coffee, cappuccinos, or just want to make your morning coffee feel a little more special, this has been a worthwhile purchase for me. It's one of those products that I use often enough that it has easily earned a permanent spot on my kitchen counter.
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Reviewed in the United States on May 29, 2026
★★★★★ 5
I love this thing!
Best invention ever! This little milk frother froths perfectly every time and maintains its foam height for the perfect latte or iced coffee. It works much better than my steamer/frother on my espresso machine so much so that I don’t feel like I need the espresso machine anymore, especially if I use this in tandem with a coffee press. The frother is compact so it doesn’t take up counter space, it’s quiet, and it is easy to clean and it creates foam for a coffee that tastes like I just went to a coffee shop! What more could you ask for?
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Reviewed in the United States on May 15, 2026
★★★★★ 3
Nice product
It works well, but takes a while to heat up.
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Reviewed in the United States on March 13, 2026