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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 2017-2019 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 adds even more heat dissipation. This 2017-2019 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 |
|---|---|---|---|
| 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.
- 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
4.1 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
Essential household item with great quality
These Q-tips cotton swabs are a household essential that I always keep stocked. The 100% cotton tips are soft yet sturdy and perfect for so many uses from beauty to first aid. The 500 count package is a great value and lasts a long time. I appreciate the quality and consistency of the original Q-tips brand. These are far superior to generic cotton swabs in terms of quality and durability.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
I only trust Q-Tip brand!! Great product. Never had luck with generic swabs.
I only trust Q-Tip brand!! This is a consistently great product. I've never had good luck with generic swabs, they either bend, don't have enough cotton on the end, or fray as I use them. These are soft tips, yet the stick is firm enough not to bend. I'll always go with Q-Tips and this 500 pack is a great value.
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Reviewed in the United States on June 2, 2026
★★★★★ 5
Quality
Soft and wo3k well very absorbent great value cotton is high and very versatility
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Reviewed in the United States on May 30, 2026
★★★★★ 4
Soft, Effective, and Great for Everyday Use
I’ve been using these cotton pads for a few weeks and overall I’m very pleased with them. The softness is one of the first things I noticed—they feel gentle on my skin and don’t cause irritation, even around the eye area.
They work well for makeup removal and hold cleanser or micellar water without falling apart. The absorbency is good, though they do soak up a little more product than I would prefer. The cotton content feels high quality, and the pads maintain their shape during use.
Another thing I appreciated is that they leave very little residue behind compared to some cheaper alternatives that shed fibers all over your face. For the price, I think they offer solid value for money, especially considering the quality and comfort.
The only reason I’m giving 4 instead of 5 stars is that I wish they were slightly less absorbent so less product would be wasted. Other than that, they’re a reliable addition to my skincare routine and I would purchase them again.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Value for your money
Qtips are better than other brands. Tried them all. The stick doesn't break. Good cotton. Cleaning performance grand!
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Reviewed in the United States on April 5, 2026