Mishimoto

Mishimoto 2020+ Chevrolet / GMC Duramax L5P 6.6L Transmission Cooler

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SKU: MISMMTC-DMAX-20
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The factory transmission cooling on the 2020+ Chevrolet and GMC ...Read More

Price:
$350.99 $386.00
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches
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Product Details

Product Description
Part Numbers
Sizing & Fit
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. Backed by the Mishimoto Lifetime Warranty.

This Part Fits:

Year Make Model Submodel
2021-2026 Chevrolet Silverado 2500 HD Custom
2020-2026 Chevrolet Silverado 2500 HD High Country
2020-2026 Chevrolet Silverado 2500 HD LT
2020-2026 Chevrolet Silverado 2500 HD LTZ
2020-2026 Chevrolet Silverado 2500 HD WT
2024-2026 Chevrolet Silverado 2500 HD ZR2
2020-2026 Chevrolet Silverado 3500 HD High Country
2020-2026 Chevrolet Silverado 3500 HD LT
2020-2026 Chevrolet Silverado 3500 HD LTZ
2020-2026 Chevrolet Silverado 3500 HD WT
2020-2026 GMC Sierra 2500 HD AT4
2024-2026 GMC Sierra 2500 HD AT4X
2020-2021 GMC Sierra 2500 HD Base
2020-2026 GMC Sierra 2500 HD Denali
2024-2026 GMC Sierra 2500 HD Denali Ultimate
2022-2026 GMC Sierra 2500 HD Pro
2020-2026 GMC Sierra 2500 HD SLE
2020-2026 GMC Sierra 2500 HD SLT
2020-2026 GMC Sierra 3500 HD AT4
2020-2021 GMC Sierra 3500 HD Base
2020-2026 GMC Sierra 3500 HD Denali
2024-2026 GMC Sierra 3500 HD Denali Ultimate
2022-2026 GMC Sierra 3500 HD Pro
2020-2026 GMC Sierra 3500 HD SLE
2020-2026 GMC Sierra 3500 HD SLT

Product Details

Product Description
Part Numbers
Sizing & Fit
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. Backed by the Mishimoto Lifetime Warranty.

This Part Fits:

Year Make Model Submodel
2021-2026 Chevrolet Silverado 2500 HD Custom
2020-2026 Chevrolet Silverado 2500 HD High Country
2020-2026 Chevrolet Silverado 2500 HD LT
2020-2026 Chevrolet Silverado 2500 HD LTZ
2020-2026 Chevrolet Silverado 2500 HD WT
2024-2026 Chevrolet Silverado 2500 HD ZR2
2020-2026 Chevrolet Silverado 3500 HD High Country
2020-2026 Chevrolet Silverado 3500 HD LT
2020-2026 Chevrolet Silverado 3500 HD LTZ
2020-2026 Chevrolet Silverado 3500 HD WT
2020-2026 GMC Sierra 2500 HD AT4
2024-2026 GMC Sierra 2500 HD AT4X
2020-2021 GMC Sierra 2500 HD Base
2020-2026 GMC Sierra 2500 HD Denali
2024-2026 GMC Sierra 2500 HD Denali Ultimate
2022-2026 GMC Sierra 2500 HD Pro
2020-2026 GMC Sierra 2500 HD SLE
2020-2026 GMC Sierra 2500 HD SLT
2020-2026 GMC Sierra 3500 HD AT4
2020-2021 GMC Sierra 3500 HD Base
2020-2026 GMC Sierra 3500 HD Denali
2024-2026 GMC Sierra 3500 HD Denali Ultimate
2022-2026 GMC Sierra 3500 HD Pro
2020-2026 GMC Sierra 3500 HD SLE
2020-2026 GMC Sierra 3500 HD SLT

Product Details

Product 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. Backed by the Mishimoto Lifetime Warranty.

This Part Fits:

Year Make Model Submodel
2021-2026 Chevrolet Silverado 2500 HD Custom
2020-2026 Chevrolet Silverado 2500 HD High Country
2020-2026 Chevrolet Silverado 2500 HD LT
2020-2026 Chevrolet Silverado 2500 HD LTZ
2020-2026 Chevrolet Silverado 2500 HD WT
2024-2026 Chevrolet Silverado 2500 HD ZR2
2020-2026 Chevrolet Silverado 3500 HD High Country
2020-2026 Chevrolet Silverado 3500 HD LT
2020-2026 Chevrolet Silverado 3500 HD LTZ
2020-2026 Chevrolet Silverado 3500 HD WT
2020-2026 GMC Sierra 2500 HD AT4
2024-2026 GMC Sierra 2500 HD AT4X
2020-2021 GMC Sierra 2500 HD Base
2020-2026 GMC Sierra 2500 HD Denali
2024-2026 GMC Sierra 2500 HD Denali Ultimate
2022-2026 GMC Sierra 2500 HD Pro
2020-2026 GMC Sierra 2500 HD SLE
2020-2026 GMC Sierra 2500 HD SLT
2020-2026 GMC Sierra 3500 HD AT4
2020-2021 GMC Sierra 3500 HD Base
2020-2026 GMC Sierra 3500 HD Denali
2024-2026 GMC Sierra 3500 HD Denali Ultimate
2022-2026 GMC Sierra 3500 HD Pro
2020-2026 GMC Sierra 3500 HD SLE
2020-2026 GMC Sierra 3500 HD SLT

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