Mishimoto 2020+ Chevrolet / GMC Duramax L5P 6.6L Transmission Cooler
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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 InstructionsThis 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 |
Please read the policy below to familiarize yourself with how we operate.
Please verify the part number that you are ordering before you place your order. If a part is ordered incorrectly by the customer and then returned, the customer will be responsible for all shipping charges and will be subject to a 20% restocking fee. We cannot be held responsible for manufacturer misinformation. If we messed up the order, then of course, we will take care of it. An RGA number must be requested within 7 days of receipt of the product by the customer. Returns must be received within 30 days of the initial purchase. We do not accept returns after 30 days. If an RGA is requested after 7 days of receiving the product then only an in-store credit will be issued. We do not refund shipping costs.
At Offroad Trading Company, we are committed to providing high-quality products and ensuring customer satisfaction. It does not matter if it is a Jeep, Truck, Bronco or any other 4x4 vehicle, our extensive experience and deep understanding of the off-road industry enable us to offer products that meet the highest standards of quality and performance. Choosing Offroad Trading Company means choosing a partner who is as passionate about off-roading as you are.