Cold Case Radiators GMT556A21 Performance Aluminum Radiator 1977-1987 GM Truck Automatic

The Cold Case Radiators GMT556A21 is a high-performance aluminum radiator engineered for 1977-1987 Chevrolet and GMC trucks with automatic transmissions. This 21-inch tall crossflow radiator delivers superior cooling efficiency compared to stock radiators, making it ideal for both stock and high-performance applications.

Construction and Design:

• 100% TIG-welded aluminum construction for maximum durability and heat dissipation
• 2-row core with oversized 1.25-inch tubes for increased coolant flow
• 16 fins per inch with corrugated design for greater surface area and thermal transfer
• Core dimensions: 28.35 inches wide x 18.8 inches tall
• Overall dimensions: 34.33 inches wide x 21 inches tall x 3 inches thick
• Polished OE-style tanks with internally welded filler necks for a factory appearance

Key Features:

• Integrated automatic transmission cooler with 5/16-inch inverted flare fittings
• Crossflow design with upper inlet on driver side and lower outlet on passenger side
• 1.25-inch upper hose outlet and 1.5-inch lower hose outlet
• Direct bolt-in fitment with no modifications required
• Original-appearing design with correct stampings
• Factory pressure tested for reliability

Cold Case radiators feature massive cores that utilize the entire width of their tanks, eliminating hot and cold spots while maximizing cooling efficiency. The lightweight aluminum construction significantly reduces weight compared to stock copper-brass radiators while providing superior heat transfer. Backed by Cold Case's limited lifetime warranty, this radiator is designed to drop in like the original and deliver exceptional cooling performance.