add wishlist add wishlist show wishlist add compare add compare show compare preloader
Mishimoto

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

SKU: MISMMTC-L5P-TBVFF
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Sale
$122.34 $112.09
100 left in stock, order soon! Not in stock, contact us!
Add to wishlist Added to wishlist
Add to compare Added to compare

FREE FAST USA DELIVERY $99+

HIGHEST QUALITY & SERVICE

LOWEST PRICE GUARANTEE

  • Description
  • Shipping
  • RETURNS
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

All products ship from USA and typically arrive at the following speeds:

- USA in 1-3 Business Days
- Canada in 1-3 Business Days
- Europe in 2-5 Business Days
- Australia in 3-7 Business Days
- Asia in 3-7 Business Days
- Rest of the World in 5-10 Business Days

*** The following estimated shipping speeds, do not include processing time or back orders. Please expect above shipping speeds on in stock items only.

* We ship internationally, contact us for quotes or simply check out online!
* Free shipping in USA on absolutely everything at Tune2mod with ground shipping. Total must be $99 or more. Valid only within lower 48 states. We may choose faster shipping service depending on product being sold at our cost.
* We have the right to modify or cancel this promotion.
* Special orders, cores or overweight items may result in additional charge.
* Please inquire with us regarding faster shipping methods or overnight delivery.
* We ship from one of our 3 warehouses: Pennsylvania, Nevada or Texas USA
* Fast and reliable shipping is offered through our main worldwide known carriers: FedEx, UPS, DHL and USPS. Simply check out and cheapest/fastest shipping will be automatically provided to you. Shipping is available to most countries in the world. 

Duties and Taxes

- Tune2mod must comply with all rules and regulations on exporting and importing laws. We are aware that there may be some duties applied, which is why we will do our best to minimize these, by offering best shipping options that are suitable for your country. It is up to a buyer to determine what these fees are. Tune2mod is not responsible for these fees. Duties and customs fee must be paid directly to courier as we do not impose them. All items ship from USA.

*Our shipping preference*

- Although these are our preferable shipping options, we may change these anytime.

  • Shipping to USA: UPS/ FedEx courier
  • Shipping to Canada: Canada Post/USPS or DHL courier
  • Shipping worldwide: DHL courier or USPS

** Please contact us for more details, questions on specific products and/ or international orders.

Returns will be accepted in first 30 days. Items must be new with original packaging, unused, re-sellable and with all the pieces. No refunds after 30 days. There will be no exchange or returns allowed on any electronics, coilovers, engine internals, turbochargers, superchargers or turbo kits. There are absolutely no returns on items marked "Special Order" or "Pre-Order". No cancellation allowed once the product is shipped. Receipt must be provided with every order returned. Tune2Mod must approve all items processed, with (RMA) number on the box. Restocking fee of 10% of item cost will be charged on all special and non regular stock products (marked as "Not in stock, Pre-Order Now"). A fee to redirect an order will or may apply, which will be calculated depending on size and weight. Shipping and handling fee will not be refunded. Client must pay for shipping. Please expect 2 business days to process a return and 3-5 business days to issue a refund.

For more information, questions or concerns, email us at sales@tune2mod.com