MMTC-DMAX-20 Mishimoto 2020+ Chevrolet / GMC Duramax L5P 6.6L Transmission Cooler
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Mishimoto MMTC-DMAX-20
Mishimoto 2020+ Chevrolet / GMC Duramax L5P 6.6L Transmission Cooler

Free Ground Shipping to USA (Lower 48)

2 sold in last 8 days
Mishimoto
MMTC-DMAX-20
MISMMTC-DMAX-20
In stock
Transmission Coolers
$386.00 $323.57
4 interest-free payments or as low as $80.89/mo with Shop Pay 4 installments. Prequalify now
Mishimoto - MMTC-DMAX-20 Transmission Coolers
The factory transmission cooling on the 2020+ Chevrolet and GMC...
$323.57
Shop Pay 4 installments
Free Gound Shipping to Continental USA
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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.

Installation Instructions
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • Own it for life - backed by Mishimoto’s Lifetime Warranty, your investment is protected long after install day.

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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