Mishimoto 2001-2005 Chevrolet/GMC 6.6L Duramax Radiator

This Mishimoto performance aluminum radiator is a direct-fit upgrade for 2001-2005 Chevrolet/GMC applications covering Sierra 2500 HD, Sierra 3500, Sierra 3500 SL, Silverado 2500 HD, Silverado 3500. It replaces the weak points of the stock part with stronger materials and better flow or cooling so heat, boost and abuse stay under control on street and track duty. AutoTalent lists verified US-market fitment in the table below.

Why upgrade

Mishimoto has released a performance aluminum radiator for the 2001-2005 Chevrolet/GMC 6.6L Duramax. Mishimoto performance radiators are manufactured from high-quality aircraft-grade aluminum with a 100-percent aluminum core and polished end tanks. The Mishimoto 6. Mishimoto engineers these kits around real chassis packaging, so hoses, coolers and adapters line up without fabrication on the listed years. Follow the published torque specs and install guide, reuse sensors where instructed, and confirm clearances if you run other supporting mods. Every unit ships with the Mishimoto Lifetime Warranty for as long as you own it.

Features

• 100% brazed aluminum core delivers more efficient heat transfer than the factory unit — built for the sustained towing and hauling demands of the early Duramax diesel.
• Natural aluminum finish and TIG-welded construction deliver durability and corrosion resistance the factory plastic-tank radiator cannot match over time.
• Magnetic Drain Plug included — captures harmful metallic debris with no additional hardware needed for a complete install.
• TIG-welded aluminum construction replaces the factory plastic-tank radiator that degrades under the sustained heat and pressure of diesel operation.
• 100% brazed aluminum core transfers thermal energy into the airstream more efficiently than the lower-density factory unit under towing and load conditions.
• Confirmed direct fit for the 2001–2005 Chevrolet/GMC trucks equipped with the 6.6L Duramax — no cutting, fabricating, or adapter work required.
• Full aluminum construction handles the thermal demands of stock and modified Duramax builds, including towing-spec and performance-tuned setups.

What's Included

• Mishimoto Radiator
• Magnetic Drain Plug
• Mishimoto Lifetime Warranty

Specifications

Fitment Notes

Verified against Mishimoto US applications and dealer listing for 2001-2005 (6 rows). Years extended to 2027 where the US model remains in production.

Vehicle Fitment