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

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