Skip to content

Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit

Marsoni M251S
Sale price$99.95
Pay 4 payments of $24.99 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
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
Easy Shipping

Quick Dispatch:

Your Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit ships.

Need Help?
Questions about Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit in your area.

Get Shipping Estimates

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 1508 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
S
Verified Purchase
sabina sorto
Louisville, US
★★★★★ 5
Totalmente Recomendable
Color: Black, Size: Wheel-132''
Es fácil de armar por qué las piezas vienen bien señalizadas y eso facilita armario , Es alto, el materia es resistente y el hierro es de negro opaco que hace que luzca bien, la tela resistente no pasa la luz, las ruedas giran muy bien y son angostos y es liviano de fácil de manipular, me encantó y estoy feliz de mi compra ! No me faltó ninguna pieza y ya eso es mucho también !!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2024
N
Verified Purchase
Nataly Orama
Lowell, US
★★★★★ 5
Recomendado
Color: Black, Size: Wheel-176''
Es fuerte cubre bien no se transparenta
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 24, 2025
H
Verified Purchase
Hency
Belleville, US
★★★★★ 3
Not great
Color: Black, Size: Wheel-132''
The product arrived and in good condition but I can’t assemble the tube A to tube B because i still have to deburr the inside part of the hole. They did not clean the drilled holes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 13, 2024
T
Verified Purchase
T
Massapequa, US
★★★★★ 1
Almost impossible to assemble 😞
Color: Beige, Size: Wheel-22''
Took 2 people to stretch the fabric out, to connect to the poles, and the side bars did not match to the holes that you push/slide together
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
Y
Verified Purchase
Y. B.
Omaha, US
★★★★★ 3
check measurements
Color: Black, Size: Wheel-176''
smaller than expected
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2025

recommand products