CSF 3975 Radiator
OE Quality 60-Day Returns
CSF

CSF 3975 Radiator

Brand CSF 3975
Core Thickness 1 1/4
Core Width 23 3/8
Core Material Aluminum
Tank Material Plastic
Core Length 37 9/16
Inlet Diameter 1 5/16 left
Outlet Diameter 1 1/2 right
Down Flow Or Cross Flow Type Cross flow
Box Height (in) 7 1/16
Box Length (in) 48
Box Weight (lbs) 26
Box Width (in) 29 7/16
Hazardous Material No
Inlet Length (in) 23 13/16
Inlet Width (in) 1 15/16
No. Of Rows 1
Oil Cooler (in) 11 1/2 left & right (high-efficiency plate type)
Outlet Length (in) 23 13/16
Outlet Width (in) 2 7/16
Radiator Cap Supplied No
Tech Note O.e.m. style plastic tank & aluminum core with quick-connect outl
Fits Chevrolet and GMC · 28 vehicles

OE-style replacement. Plastic tank and aluminum core match the original layout for straightforward service.

Cross-flow cooling. Engineered for efficient airflow and consistent heat transfer.

Proven CSF quality. Built by an ISO-certified manufacturer with decades of radiator production experience.

Cross-references BBB Industries 13885, 84565799 and 84889155 for the same application. See all 4.

$253.81Free shipping
In stock · usually ships same day before 1pm CST
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Order total $253.81
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Free returns within 60 days if it doesn't fit when fitment is verified.
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CSF 3975 Radiator for Heavy-Duty GM Trucks

CSF 3975 is an OE-style radiator built for select 2020-2026 Chevrolet Silverado 2500 HD and Silverado 3500 HD, plus GMC Sierra 2500 HD and Sierra 3500 HD applications. It uses an aluminum core with plastic tanks and a cross-flow layout to match the factory-style cooling package while adding a heavier-duty core design for these trucks.

  • Aluminum core with plastic tank construction
  • Cross-flow radiator design
  • 1-row core with 1 1/4 in. thickness
  • Core dimensions: 37 9/16 in. length, 23 3/8 in. width
  • Inlet: 1 5/16 in. left; outlet: 1 1/2 in. right
  • Integrated high-efficiency plate-type oil cooler, left and right
  • Quick-connect outlet pipe and quick-connect oil cooler fittings
  • Radiator cap not supplied

Detailed Product Overview

Built by CSF, part number 3975 is engineered and wind-tunnel tested for cooling performance validation, with manufacturing backed by ISO/TSO-certified facilities. This radiator is designed around the factory-style plastic tank and aluminum core layout, while the upgraded heavy-duty core specification is listed for 2020-2026 Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD trucks. This part cross-references BBB Industries 13885 for the same application.

Common Cooling Issues Addressed

  • Cracked or leaking radiator tanks
  • Restricted coolant flow from an aging core
  • Transmission or engine cooling concerns tied to radiator wear
  • Damaged quick-connect fittings or outlet pipe connections
  • Cooling system service needs on heavy-duty Silverado and Sierra trucks

Installation Notes and Tips

Verify inlet and outlet orientation before installation: inlet is on the left and outlet is on the right. Confirm the vehicle uses the listed quick-connect outlet pipe and oil cooler fittings, and compare core dimensions and hose connections against the original radiator before removal. The radiator cap is not included, so reuse or replace the cap separately as needed.

Quality Assurance

CSF manufactures radiators to high-performance standards and validates cooling performance through laboratory testing. With more than 10,000 radiator models produced and over 30 million units sold worldwide, CSF 3975 reflects the brand’s long-running focus on OE-style fit and cooling-system consistency.

Related reading

This part fits 28 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2026ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2026ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2026GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2026GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2025ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2025ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2025GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2025GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2024ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2024ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2024GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2024GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2023ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2023ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2023GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2023GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2022ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2022ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2022GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2022GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2021ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2021ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2021GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2021GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2020ChevroletSilverado 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2020ChevroletSilverado 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2020GMCSierra 2500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
2020GMCSierra 3500 HD6.6LV8N/AUpgraded Heavy Duty Core. 20% Thicker 2 Row 42mm core vs OEM 1 Row 35mm core
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 138858456579984889155GM3010625