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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.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 21 reviews
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Product Reviews
★★★★★ 5
Beautiful very colorful and comfortable
Color: 02.Feb(Amethyst)
These really are so cute--the purple color of the butterfly really stands out and when I'm wearing them, I can't even tell that I have them on.
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Reviewed in the United States on October 20, 2025
★★★★★ 5
Perfect. A must have!
Size: XX-Large, Color: Nude
Perfect fit! After 2 battles with breast cancer and breast reconstruction I find it very difficult to find strapless or any bra for that matter that fit and are comfortable … this bra not only fits it stays put! I have purchased some pricey ones in the past but this gives a lot of bang for your buck. I also love the fact it stays in place- has rubber like adhesive that sticks to your skin and has no wires. I feel mangled after basically being amputated by a double mastectomy- I worry about the bra falling down exposing the fact I have no “nips” because cancer took all that away from me. Additionally, I like that it comes with removable straps for adjustability for extra support if needed. The quality seems to be good but I have yet to wash, just like any bra - gentle cycle wash and a flat air dry will extend the life of the bra.
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Reviewed in the United States on May 22, 2026
★★★★★ 5
Doesn't slip down
Size: XX-Large, Color: Black
Holds up very well for day to day work and doesn't slip down. Came with straps as well. Material feels great. I would base sizing off of your usual band size more than cup. Got a XXL when measured I'm usually a 38B or 36C and those sizes are too small to be comfortable and it said I'd match with a large so I went up based upon my bra experiences. Pink color isn't really a good pink tone more closer to nude and dull if anything. But all the other styles and colors are great. It feels very supportive and covers all the right places while smoothing out back rolls. It's a good stretch when you put it on to and then conforms to the chest. Pads are a little over the place but they're removable so that's expected.
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Reviewed in the United States on May 14, 2026
★★★★★ 4
An excellent strapless option
Size: XX-Large, Color: Nude
Extremely comfortable! It didn’t slip down like some do, so I don’t feel the need to tug it up. Felt like I wasn’t wearing anything at all. I also like that it comes with optional straps. Great coverage. The two things to watch for is the top seam is a little thick, so it won’t work under thin tops, and the pads will move around, but they are easy to adjust or remove. On the whole I find this a great fit and easy to wear, at an excellent price point.
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Reviewed in the United States on April 13, 2026
★★★★★ 5
Great!
Size: XX-Large, Color: Nude
REVIEW FROM A REAL PERSON WITH NO FINANCIAL INCENTIVES
This is my first time ever wearing a strapless bra and I really like this one! It's very comfy and feels like wearing any other sports bra just, well, without the straps (though they do include straps in the box that you could attach if you wanted). I'm somewhere around a 40DDD and got a 2x and it fits well, though I did wear it to work one day and by the end of the day, it did feel like it was digging/squeezing into my side a bit too much (however it had been 10hrs by then). The bra IS stretchy but if I were really any bigger, I think I'd want to go to a 3x.
Only very minor issues with it slipping, nothing even close to where I was worried anything was going to pop out or anything, even after being out in 90F heat.
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Reviewed in the United States on May 29, 2026