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

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

Mishimoto | MMTC-DMAX-20
SKU: MMTC-DMAX-20
$350.95 USD
$386.00 USD $350.95 USD
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Mishimoto MMTC-DMAX-20 - 2020+ Chevrolet / GMC Duramax L5P 6.6L Transmission Cooler

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

Automatic transmission oil cooler designed to regulate fluid temperature and prevent overheating. Enhances transmission longevity, maintains performance, and features durable construction with a precise 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.

  • 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
  • Own it for life - backed by Mishimoto’s Lifetime Warranty, your investment is protected long after install day.
SellingPoint06: 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
SellingPoint07: Own it for life - backed by Mishimoto’s Lifetime Warranty, your investment is protected long after install day.
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TechSpec Rows: 20
TechSpec Core Construction: Tube-and-Fin
TechSpec Core Length (in): 33.4
TechSpec Core Height (in): 8.3
TechSpec Core Thickness (in): 1.3
TechSpec Engine Codes: L5P
TechSpec Chassis Codes: GMT
TechSpec Transmission Codes: Allison 10-speed
TechSpec Installation Notes: N/A
TechSpec Caution: N/A
TechSpec Overall Height (in): 8.6
TechSpec Overall Length (in): 40
TechSpec Overall Width (in): 2.4
TechSpec Inlet: N/A
TechSpec Outlet: N/A
TechSpec Includes: (1) Transmission Cooler--(2) M6 Studs--Mishimoto Lifetime Warranty
TechSpec Applications: 2020+ Chevrolet/GMC 2500HD 6.6L Duramax--2020+ Chevrolet/GMC 3500HD 6.6L Duramax
TechSpec Fluid Capacity (qts): 1.5
TechSpec Note: N/A
Install Difficulty: 2
Core Height: 8.3
Core Material: Aluminum
Core Thickness: 1.3
Core Width: 33.4
Electric Fan: No
Finish: Natural Aluminum
Grade Type: Performance
Height: 8.6
Inlet Diameter: 1
Line Included: No
Mounting Hardware Included: Yes
Outlet Diameter: 1
Thickness: 2.4
Width: 40
SellingPoint01: 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.
SellingPoint02: 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.
SellingPoint03: 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.
SellingPoint04: 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.
SellingPoint05: 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.
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