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 |
- 2020-chevrolet-silverado-2500-hd-high-country-esi5106238
- 2020-chevrolet-silverado-2500-hd-lt-esi6191913
- 2020-chevrolet-silverado-2500-hd-ltz-esi7573830
- 2020-chevrolet-silverado-3500-hd-high-country-esi1816732
- 2020-chevrolet-silverado-3500-hd-lt-esi7043819
- 2020-gmc-sierra-2500-hd-at4-esi8598502
- 2020-gmc-sierra-2500-hd-base-esi4820539
- 2020-gmc-sierra-2500-hd-denali-esi4038086
- 2020-gmc-sierra-2500-hd-slt-esi1033969
- 2020-gmc-sierra-3500-hd-at4-esi7639841
- 2020-gmc-sierra-3500-hd-base-esi4989089
- 2020-gmc-sierra-3500-hd-denali-esi4543790
- 2021-chevrolet-silverado-2500-hd-custom-esi5526254
- 2021-chevrolet-silverado-2500-hd-high-country-esi4813203
- 2021-chevrolet-silverado-2500-hd-lt-esi8800061
- 2021-chevrolet-silverado-2500-hd-wt-esi9078755
- 2021-chevrolet-silverado-3500-hd-high-country-esi8279025
- 2021-chevrolet-silverado-3500-hd-lt-esi6208496
- 2021-gmc-sierra-2500-hd-at4-esi6326872
- 2021-gmc-sierra-2500-hd-base-esi6921392
- 2021-gmc-sierra-2500-hd-denali-esi4675800
- 2021-gmc-sierra-2500-hd-slt-esi2885890
- 2021-gmc-sierra-3500-hd-at4-esi3744773
- 2021-gmc-sierra-3500-hd-base-esi2388052
- 2021-gmc-sierra-3500-hd-denali-esi4288060
- 2022-chevrolet-silverado-2500-hd-custom-esi5212432
- 2022-chevrolet-silverado-2500-hd-high-country-esi7036258
- 2022-chevrolet-silverado-2500-hd-lt-esi4449841
- 2022-chevrolet-silverado-3500-hd-high-country-esi4763212
- 2022-chevrolet-silverado-3500-hd-lt-esi7712359
- 2022-gmc-sierra-2500-hd-at4-esi1045907
- 2022-gmc-sierra-2500-hd-denali-esi4423037
- 2022-gmc-sierra-2500-hd-pro-esi5789822
- 2022-gmc-sierra-2500-hd-sle-esi8565572
- 2022-gmc-sierra-2500-hd-slt-esi9732352
- 2022-gmc-sierra-3500-hd-at4-esi6595726
- 2022-gmc-sierra-3500-hd-denali-esi7543051
- 2022-gmc-sierra-3500-hd-pro-esi2795639
- 2022-gmc-sierra-3500-hd-sle-esi2808566
- 2023-chevrolet-silverado-2500-hd-custom-esi9913481
- 2023-chevrolet-silverado-2500-hd-high-country-esi4411548
- 2023-chevrolet-silverado-2500-hd-lt-esi6645007
- 2023-chevrolet-silverado-3500-hd-high-country-esi2944432
- 2023-chevrolet-silverado-3500-hd-lt-esi4979057
- 2023-gmc-sierra-2500-hd-at4-esi3997865
- 2023-gmc-sierra-2500-hd-denali-esi5369381
- 2023-gmc-sierra-2500-hd-pro-esi7040230
- 2023-gmc-sierra-2500-hd-slt-esi1880602
- 2023-gmc-sierra-3500-hd-at4-esi9812795
- 2023-gmc-sierra-3500-hd-denali-esi8840403
- 2023-gmc-sierra-3500-hd-pro-esi1795371
- 2024-chevrolet-silverado-2500-hd-custom-esi9350969
- 2024-chevrolet-silverado-2500-hd-high-country-esi5582737
- 2024-chevrolet-silverado-2500-hd-lt-esi7380118
- 2024-chevrolet-silverado-2500-hd-zr2-esi4923976
- 2024-chevrolet-silverado-3500-hd-high-country-esi5302245
- 2024-chevrolet-silverado-3500-hd-lt-esi1250425
- 2024-gmc-sierra-2500-hd-at4-esi4222336
- 2024-gmc-sierra-2500-hd-at4x-esi1608779
- 2024-gmc-sierra-2500-hd-denali-ultimate-esi8239818
- 2024-gmc-sierra-2500-hd-pro-esi1179875
- 2024-gmc-sierra-3500-hd-at4-esi7617832
- 2024-gmc-sierra-3500-hd-denali-ultimate-esi8389870
- 2024-gmc-sierra-3500-hd-pro-esi8126472
- 2025-chevrolet-silverado-2500-hd-custom-esi8717856
- 2025-chevrolet-silverado-2500-hd-high-country-esi5354103
- 2025-chevrolet-silverado-2500-hd-lt-esi2413490
- 2025-chevrolet-silverado-2500-hd-zr2-esi1767135
- 2025-chevrolet-silverado-3500-hd-high-country-esi7571167
- 2025-chevrolet-silverado-3500-hd-lt-esi4744889
- 2025-gmc-sierra-2500-hd-at4-esi3882962
- 2025-gmc-sierra-2500-hd-at4x-esi8910283
- 2025-gmc-sierra-2500-hd-denali-ultimate-esi2745746
- 2025-gmc-sierra-2500-hd-pro-esi1432863
- 2025-gmc-sierra-3500-hd-at4-esi3839281
- 2025-gmc-sierra-3500-hd-denali-ultimate-esi2289997
- 2025-gmc-sierra-3500-hd-pro-esi5034701
- 2026-chevrolet-silverado-2500-hd-custom-esi3325963
- 2026-chevrolet-silverado-2500-hd-high-country-esi2409265
- 2026-chevrolet-silverado-2500-hd-lt-esi4605609
- 2026-chevrolet-silverado-2500-hd-zr2-esi8227335
- 2026-chevrolet-silverado-3500-hd-high-country-esi7922368
- 2026-chevrolet-silverado-3500-hd-lt-esi9845119
- 2026-gmc-sierra-2500-hd-at4-esi4642304
- 2026-gmc-sierra-2500-hd-at4x-esi7075706
- 2026-gmc-sierra-2500-hd-denali-ultimate-esi9291821
- 2026-gmc-sierra-2500-hd-pro-esi3934146
- 2026-gmc-sierra-3500-hd-at4-esi5407665
- 2026-gmc-sierra-3500-hd-denali-ultimate-esi4919391
- 2026-gmc-sierra-3500-hd-pro-esi2814575
- ClearanceItem:N
- Cooling>Transmission Coolers
- EPA:N/A
- fits_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
- fits_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
- fits_2020-2026`GMC`Sierra 3500 HD`SLT
- fits_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
- fits_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
- LTL:N
- MPN:MMTC-DMAX-20
- Non-CARB:N
- Prop65:Y
- SpecialOrder:N