The CSF heavy-duty radiator upgrades the 2020-2024 Chevy Silverado and GMC Sierra 2500/3500 HD 6.6L Duramax with a 2-row 42mm aluminum core that runs about 20% thicker than the factory 1-row 35mm unit. The crossflow design integrates both an engine oil cooler and a transmission oil cooler, and high-performance multi-louvered fins with EPDM gaskets improve cooling and durability under heavy load and towing.
| Type | Heavy-duty radiator (plastic tank / aluminum core) |
| Material | Plastic tanks, aluminum core |
| Core | 2-row 42mm, ~20% thicker than factory 1-row 35mm |
| Oil Cooler | Integrated engine oil cooler |
| Transmission Cooler | Integrated transmission oil cooler |
| Fins | High-performance multi-louvered |
| Part Number | 3975 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2020-2024 | Chevrolet | Silverado | All |
| 2020-2024 | GMC | Sierra 2500 | All |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
