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-esi2759365
- 2020-chevrolet-silverado-2500-hd-lt-esi3044512
- 2020-chevrolet-silverado-2500-hd-ltz-esi8939551
- 2020-chevrolet-silverado-3500-hd-high-country-esi6291163
- 2020-chevrolet-silverado-3500-hd-lt-esi7639727
- 2020-gmc-sierra-2500-hd-at4-esi1491754
- 2020-gmc-sierra-2500-hd-base-esi4937909
- 2020-gmc-sierra-2500-hd-denali-esi3996562
- 2020-gmc-sierra-2500-hd-slt-esi2768919
- 2020-gmc-sierra-3500-hd-at4-esi1573497
- 2020-gmc-sierra-3500-hd-base-esi5136933
- 2020-gmc-sierra-3500-hd-denali-esi2528551
- 2021-chevrolet-silverado-2500-hd-custom-esi9879206
- 2021-chevrolet-silverado-2500-hd-high-country-esi5045135
- 2021-chevrolet-silverado-2500-hd-lt-esi6168057
- 2021-chevrolet-silverado-2500-hd-wt-esi5347913
- 2021-chevrolet-silverado-3500-hd-high-country-esi6458092
- 2021-chevrolet-silverado-3500-hd-lt-esi3245409
- 2021-gmc-sierra-2500-hd-at4-esi7943559
- 2021-gmc-sierra-2500-hd-base-esi7503648
- 2021-gmc-sierra-2500-hd-denali-esi1221986
- 2021-gmc-sierra-2500-hd-slt-esi9004128
- 2021-gmc-sierra-3500-hd-at4-esi3268059
- 2021-gmc-sierra-3500-hd-base-esi6337613
- 2021-gmc-sierra-3500-hd-denali-esi6410654
- 2022-chevrolet-silverado-2500-hd-custom-esi5303805
- 2022-chevrolet-silverado-2500-hd-high-country-esi7242354
- 2022-chevrolet-silverado-2500-hd-lt-esi2136628
- 2022-chevrolet-silverado-3500-hd-high-country-esi5171538
- 2022-chevrolet-silverado-3500-hd-lt-esi1489700
- 2022-gmc-sierra-2500-hd-at4-esi1005364
- 2022-gmc-sierra-2500-hd-denali-esi6598946
- 2022-gmc-sierra-2500-hd-pro-esi3222701
- 2022-gmc-sierra-2500-hd-sle-esi3666358
- 2022-gmc-sierra-2500-hd-slt-esi4166084
- 2022-gmc-sierra-3500-hd-at4-esi7400879
- 2022-gmc-sierra-3500-hd-denali-esi7719026
- 2022-gmc-sierra-3500-hd-pro-esi4837003
- 2022-gmc-sierra-3500-hd-sle-esi8493590
- 2023-chevrolet-silverado-2500-hd-custom-esi3877092
- 2023-chevrolet-silverado-2500-hd-high-country-esi9574778
- 2023-chevrolet-silverado-2500-hd-lt-esi5064350
- 2023-chevrolet-silverado-3500-hd-high-country-esi8238392
- 2023-chevrolet-silverado-3500-hd-lt-esi1944245
- 2023-gmc-sierra-2500-hd-at4-esi2939542
- 2023-gmc-sierra-2500-hd-denali-esi9917617
- 2023-gmc-sierra-2500-hd-pro-esi6426112
- 2023-gmc-sierra-2500-hd-slt-esi7652580
- 2023-gmc-sierra-3500-hd-at4-esi8213090
- 2023-gmc-sierra-3500-hd-denali-esi9466335
- 2023-gmc-sierra-3500-hd-pro-esi6006361
- 2024-chevrolet-silverado-2500-hd-custom-esi6151113
- 2024-chevrolet-silverado-2500-hd-high-country-esi9077495
- 2024-chevrolet-silverado-2500-hd-lt-esi1502127
- 2024-chevrolet-silverado-2500-hd-zr2-esi5725617
- 2024-chevrolet-silverado-3500-hd-high-country-esi5848709
- 2024-chevrolet-silverado-3500-hd-lt-esi1340327
- 2024-gmc-sierra-2500-hd-at4-esi1523877
- 2024-gmc-sierra-2500-hd-at4x-esi7333223
- 2024-gmc-sierra-2500-hd-denali-ultimate-esi5614287
- 2024-gmc-sierra-2500-hd-pro-esi5852227
- 2024-gmc-sierra-3500-hd-at4-esi6953384
- 2024-gmc-sierra-3500-hd-denali-ultimate-esi8930501
- 2024-gmc-sierra-3500-hd-pro-esi6176144
- 2025-chevrolet-silverado-2500-hd-custom-esi7728825
- 2025-chevrolet-silverado-2500-hd-high-country-esi4729652
- 2025-chevrolet-silverado-2500-hd-lt-esi5202487
- 2025-chevrolet-silverado-2500-hd-zr2-esi4200743
- 2025-chevrolet-silverado-3500-hd-high-country-esi4838492
- 2025-chevrolet-silverado-3500-hd-lt-esi9343798
- 2025-gmc-sierra-2500-hd-at4-esi8523215
- 2025-gmc-sierra-2500-hd-at4x-esi2250814
- 2025-gmc-sierra-2500-hd-denali-ultimate-esi3673521
- 2025-gmc-sierra-2500-hd-pro-esi4387000
- 2025-gmc-sierra-3500-hd-at4-esi8939488
- 2025-gmc-sierra-3500-hd-denali-ultimate-esi8523488
- 2025-gmc-sierra-3500-hd-pro-esi4421765
- 2026-chevrolet-silverado-2500-hd-custom-esi2768755
- 2026-chevrolet-silverado-2500-hd-high-country-esi3738867
- 2026-chevrolet-silverado-2500-hd-lt-esi8310682
- 2026-chevrolet-silverado-2500-hd-zr2-esi4242138
- 2026-chevrolet-silverado-3500-hd-high-country-esi7677287
- 2026-chevrolet-silverado-3500-hd-lt-esi3139505
- 2026-gmc-sierra-2500-hd-at4-esi6196571
- 2026-gmc-sierra-2500-hd-at4x-esi5979849
- 2026-gmc-sierra-2500-hd-denali-ultimate-esi8182883
- 2026-gmc-sierra-2500-hd-pro-esi3741847
- 2026-gmc-sierra-3500-hd-at4-esi9223712
- 2026-gmc-sierra-3500-hd-denali-ultimate-esi4695703
- 2026-gmc-sierra-3500-hd-pro-esi4361323
- 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