Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+
Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+

Mishimoto

Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+

$350.95
SKU: MMTC-DMAX-20

Transmission Cooler, Silver, fits Chevrolet/GMC 6.6L Duramax L5P 2020+

MCQUEEN

190 South McQueen Road
Suite 109
Gilbert AZ 85233
United States

+14806332929

STATE OF CALIFORNIA CONSUMER WARNING

Description:

The factory transmission cooling on the 2020+ Chevrolet and GMC Duramax L5P 6.6L is sized for stock duty, and fluid temperatures climb fast under the sustained load of towing and heavy hauling. Heat is what wears a transmission out. The Mishimoto Transmission Cooler attacks the problem with raw capacity: a tube-and-fin core with a 245% increase in core volume over stock, giving the system far more headroom to keep fluid temperatures in a safe range when the truck is working hardest.


The core also adds a 137% increase in frontal area, putting more of the cooler directly in the incoming airstream, and a 173% increase in external fin area to move heat from the fluid into the air more efficiently. All-aluminum construction handles the thermal demands of stock and modified Duramax trucks alike, and the cooler retains the factory transmission line connections for a clean, complete upgrade with no additional adapters or plumbing.

Direct fit for the 2020+ Chevrolet and GMC Duramax L5P 6.6L. No drilling, cutting, or modification required.
Key Benefits:
  • 245% larger core volume for serious heat dissipation - the oversized tube-and-fin core gives the transmission far more capacity to pull heat from the fluid under tow and heavy load.
  • 137% more frontal area catches more cooling airflow - the larger frontal core area puts more of the cooler in the incoming airstream to drop fluid temps faster.
  • Factory connections, no adapters required - the cooler uses the OEM transmission line connections for a complete bolt-on upgrade with no extra fittings or plumbing work.
  • Tube-and-fin aluminum core built for sustained load - durable all-aluminum construction holds transmission temps in check through the heat of towing where stock cooling falls short.
  • 173% more external fin area accelerates heat transfer - the added fin surface moves thermal energy from the fluid into the airstream far more efficiently than the stock cooler.
  • Drops in without modification - confirmed direct fit for 2020+ Chevrolet and GMC Duramax L5P 6.6L trucks, with no cutting, fabricating, or adapter work required

Shipping & Returns

SHIPPING POLICY
There is a chance that your cart will display no shipping charges. Certain items populate a standard shipping rate, others are advertised as free shipping to the lower 48, and others (often multiple parts or larger orders) may not show a rate. There is nothing more to do on your end if it is free or flat-rate shipping.

If your order does require a shipping cost/option, our shipping department will determine the shipping charges, and we will email you the cost/options for your order to ship out. Once you receive that email, there will be a link to pay for the charges, or you can cancel the order and be fully refunded.

OFFERS OF FREE SHIPPING:
All free ground shipping offers only apply to shipping addresses in the continental United States. This notification will appear above the product information and on the cart page.

FLAT RATE GROUND SHIPPING:
Some products have a standard ground shipping policy if you require the product faster, please notify us in the notes section during checkout.

If you have special shipping requirements, please contact our sales department. Email us help@sdhqoffroad.com

PROCESSING YOUR ORDER:
If shipping costs need to be calculated/added, you will be emailed with an updated link to your order. Your updated order will include your order's shipping costs and be your original order with the letter "A" at the end. While checking for updates on your order, please add an "A" to the end of your order number, as your order number without the "A" will show canceled since it has been superseded.

FIBERGLASS SHIPPING POLICY:
Our shipping department takes the same time and effort in packaging your products as our engineers do in designing them. However, damage can still occur in shipping. Most of these damaged items can be easily repaired during install and or in paint prep. If this is not the case, the buyer must inspect the packaging and the products carefully upon receiving them, then accept the shipment and if need be, notate any damages and irregularities, such as crushed, torn, punctured, or broken parts on both the packaging and the product, on the freight bill or receipt at the driver’s presence. A signed receipt without any notation releases the carrier as well as SDHQ from any further damage claim. Discovery of damages after a clear delivery becomes the responsibility of the customer. The buyer must notify SDHQ of any damages within 24 hours. In cases of damage with proper notion on receipt, the carrier will determine whether to pay for the repair cost or replacement value of the damaged goods after damage inspection. Replacement value is the amount the buyer paid to SDHQ and is not negotiable. All disputes about the settlement amount shall be addressed with the carrier. SDHQ, under no circumstances, shall be liable for the damaged product or for subsequent settlement of the claim with the carrier.

POWDER COATED ROCK SLIDERS SHIPPING POLICY: While we pack with care, we advise against shipping powder-coated sliders due to the risk of scuffs/scratches during transit. Any shipping-related damage isn't covered by SDHQ.

GOOSE GEAR SHIPPING POLICY: All Goose Gear products are made-to-order. Once your order is placed, it cannot be cancelled or refunded. By checking this box, you acknowledge and agree to these terms. Thank you for understanding the unique nature of our custom manufacturing process.

RETURNS:
Some items may be eligible to be returned if returned as new within 30 days of shipping, with a 20% re-stocking fee. If eligible for return, the return amount will be for store credit. There are NO returns after 30 days from the date of receipt. Freight is nonrefundable. Refunds will be given on parts only and exclude labor or installation charges, shipping, or any other charges. All parts must be returned in the original package, cannot be damaged or installed, and must be in original condition.

For further info on our return policy, please visit the Online order returns page.

Shipping & Returns

SHIPPING POLICY
There is a chance that your cart will display no shipping charges. Certain items populate a standard shipping rate, others are advertised as free shipping to the lower 48, and others (often multiple parts or larger orders) may not show a rate. There is nothing more to do on your end if it is free or flat-rate shipping.

If your order does require a shipping cost/option, our shipping department will determine the shipping charges, and we will email you the cost/options for your order to ship out. Once you receive that email, there will be a link to pay for the charges, or you can cancel the order and be fully refunded.

OFFERS OF FREE SHIPPING:
All free ground shipping offers only apply to shipping addresses in the continental United States. This notification will appear above the product information and on the cart page.

FLAT RATE GROUND SHIPPING:
Some products have a standard ground shipping policy if you require the product faster, please notify us in the notes section during checkout.

If you have special shipping requirements, please contact our sales department. Email us help@sdhqoffroad.com

PROCESSING YOUR ORDER:
If shipping costs need to be calculated/added, you will be emailed with an updated link to your order. Your updated order will include your order's shipping costs and be your original order with the letter "A" at the end. While checking for updates on your order, please add an "A" to the end of your order number, as your order number without the "A" will show canceled since it has been superseded.

FIBERGLASS SHIPPING POLICY:
Our shipping department takes the same time and effort in packaging your products as our engineers do in designing them. However, damage can still occur in shipping. Most of these damaged items can be easily repaired during install and or in paint prep. If this is not the case, the buyer must inspect the packaging and the products carefully upon receiving them, then accept the shipment and if need be, notate any damages and irregularities, such as crushed, torn, punctured, or broken parts on both the packaging and the product, on the freight bill or receipt at the driver’s presence. A signed receipt without any notation releases the carrier as well as SDHQ from any further damage claim. Discovery of damages after a clear delivery becomes the responsibility of the customer. The buyer must notify SDHQ of any damages within 24 hours. In cases of damage with proper notion on receipt, the carrier will determine whether to pay for the repair cost or replacement value of the damaged goods after damage inspection. Replacement value is the amount the buyer paid to SDHQ and is not negotiable. All disputes about the settlement amount shall be addressed with the carrier. SDHQ, under no circumstances, shall be liable for the damaged product or for subsequent settlement of the claim with the carrier.

POWDER COATED ROCK SLIDERS SHIPPING POLICY: While we pack with care, we advise against shipping powder-coated sliders due to the risk of scuffs/scratches during transit. Any shipping-related damage isn't covered by SDHQ.

GOOSE GEAR SHIPPING POLICY: All Goose Gear products are made-to-order. Once your order is placed, it cannot be cancelled or refunded. By checking this box, you acknowledge and agree to these terms. Thank you for understanding the unique nature of our custom manufacturing process.

RETURNS:
Some items may be eligible to be returned if returned as new within 30 days of shipping, with a 20% re-stocking fee. If eligible for return, the return amount will be for store credit. There are NO returns after 30 days from the date of receipt. Freight is nonrefundable. Refunds will be given on parts only and exclude labor or installation charges, shipping, or any other charges. All parts must be returned in the original package, cannot be damaged or installed, and must be in original condition.

For further info on our return policy, please visit the Online order returns page.

Quality

We pride ourselves on offering only top-tier products, handpicked through strategic partnerships with the industry's elite.

When you choose us, you're investing in unparalleled quality and craftsmanship.

Learn more about what 'SDHQ Built' means to us here.

Quality

We pride ourselves on offering only top-tier products, handpicked through strategic partnerships with the industry's elite.

When you choose us, you're investing in unparalleled quality and craftsmanship.

Learn more about what 'SDHQ Built' means to us here.

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Secure Payment

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

We accept payments with :
Visa, MasterCard, Shop Pay, PayPal, Apple Pay, Discover and more.

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