Radiator for GMC Sierra (2008-2013) 4.8L 5.3L 6.0L

Heavy-Duty 3-Row All-Aluminum Radiator for 2008-2013 GMC Sierra (GMT900)

What it Does: The 3-row aluminum radiator replaces the failure-prone factory heat exchanger on the 2008-2013 GMC Sierra to maximize heat dissipation and maintain stable coolant temperatures during heavy hauling and high-load towing.

The Stock GMC Sierra Cooling Weakness

Factory radiators on the GMT900 platform rely on plastic end tanks mechanically crimped to an aluminum core with elastomer gaskets. Continuous heat cycling and cooling system pressurization degrade the composite plastic, causing it to become brittle and crack at the inlet and outlet necks or leak along the crimp seams. Additionally, the standard single-row core suffers from heat soak during heavy towing, straining the integrated engine oil and transmission coolers and risking elevated fluid temperatures across the Vortec drivetrain.

The Engineering Solution

This heavy-duty unit is engineered with an all-aluminum crossflow construction and precision TIG-welded tanks, completely eliminating failure-prone plastic and crimped seams. Featuring a high-density 3-row core measuring 34 inches between tanks by 17-1/4 inches high, it provides a massive increase in cooling surface area and fluid capacity compared to standard single-row units. Integrated internal heat exchangers accommodate both passenger-side transmission fluid lines and driver-side engine oil lines, preserving critical lubricant viscosities under severe duty cycles.

What's Included

• 1 x 3-Row All-Aluminum Crossflow Radiator (34-Inch Core Width)

Technical Specifications

Compatibility

• 2008-2013 GMC Sierra 4.8L V8 (34-inch core)
• 2008-2013 GMC Sierra 5.3L V8 (34-inch core)
• 2008-2009 GMC Sierra 6.0L V8 (34-inch core)
• 2011-2013 GMC Sierra 6.0L V8 (34-inch core)

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT900 Sierra?

Yes, this is a direct fit for the 2008-2013 GMC Sierra equipped with Vortec 4.8L, 5.3L, and 6.0L V8 engines. This unit does not fit 2010 GMC Sierra 1500 6.0L models, nor will it fit models equipped with the optional 28-inch radiator core.

How do I confirm this fits my Sierra before ordering?

Measure the core width between the side tanks to verify your truck has the 34-inch core rather than the smaller 28-inch configuration.

The GMC Heavy-Duty Standard

Built for dependable towing and demanding job sites, this all-aluminum core ensures maximum thermal resilience and prevents catastrophic overheating when your truck is working hardest.