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For Your Every Summer RSVP, with Code: SUMMER15
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+ 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 add even more heat dissipation. This 2017+ 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 |
|---|---|---|---|
| 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.
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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
4.9 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Safe for the whole family
Size: 2.82 Fl Oz (Pack of 1)
Finally, a clean beauty sunscreen I trust for everyone. No irritation, no white cast—just healthy, hydrated skin.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Great skin wash product!
I have read many reviews about this face wash. I am looking for products that are chemical free; and I look into a lot of them. I look for great ingredients. This makes my skin feel great, smells amazing; and works very well. I love the way that it cleans my face! Definitely will be buying more!
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Reviewed in the United States on June 23, 2025
★★★★★ 5
Great to get clean, clear skin!
While its claims are to help with jock itch, athletes foot and body acne, I don't have those conditions. I purchased it to help my eczema rash breakouts that are itchy and bumpy. This works great to reduce both! Tea tree products tend to have a recognizable, and to me, unpleasant odor. This one has a more pleasant scent than any other product I've tried.
I've since tried less expensive tea tree/eucalyptus soaps with no results at all and none had the fresh, clean scent of this one! I'm very happy with this product and have just signed up for the subscription!
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Reviewed in the United States on December 3, 2022
★★★★★ 4
Great product, terrible leaky packaging!
This wash is fantastic, my skin loves it, I love the sweet woodsy scent ... but the tube / product packaging seems to be cheap. The flip cap has a VERY weak hinge which broke during transit and leaked all over my sink and countertop. I'm treating the original packaging as unreliable by taping it shut during storage and using a generic dispenser day to day.
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Reviewed in the United States on July 13, 2025
★★★★★ 5
Not just for “Active People”!
I originally bought this for my SO. He’s a chef, and after working long hours in a hot kitchen wearing a heavy chef’s uniform, he has a lot of uncomfortable sweat-related issues. He liked it so much that I decided to try it for the chub rub and underboob rashes that plague me every summer. Sweet relief! My swampy spots are clean and healthy, and it’s surprisingly moisturizing for a purifying cleanser. I’m also really sensitive to perfumes and heavy fragrances, but the tea tree, eucalyptus, and thyme combo is clean and fresh, and somehow simultaneously energizing and calming. As for the price, a small amount of this cleanser goes a really long way. We would normally go through a water-based cheaper cleanser in this size in about a week. We’ve been using this for 2 weeks and it’s only about halfway gone. I try to be thrifty with most things but this product is more than worth the price tag!
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Reviewed in the United States on June 8, 2022