Dorman 918-278 Automatic Transmission Oil Cooler - Auxiliary

Overview of Dorman 918-278 Automatic Transmission Oil Cooler

The Dorman 918-278 automatic transmission oil cooler is designed to provide reliable cooling performance for heavy-duty Chevrolet and GMC trucks. Engineered with durable aluminum construction and precise dimensions, this cooler helps maintain optimal transmission temperatures for vehicles like the Silverado 2500 HD and Sierra 3500 HD.

• Constructed from corrosion-resistant aluminum with a black finish
• Core features 8 rows for efficient heat dissipation
• Inlet and outlet diameters measure 41.275 mm with male thread attachments
• Compact dimensions: 10.9 inches wide, 5.6 inches high, and 1.98 inches deep
• Includes transmission cooler and mounting bracket; installation hardware not included
• Standard replacement grade for dependable performance

Detailed Product Description

The Dorman 918-278 automatic transmission oil cooler is specifically designed for use with Chevrolet and GMC heavy-duty trucks, including the Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, and Sierra 3500 HD models. Its aluminum core with 8 rows ensures effective heat transfer, helping to prevent transmission overheating during demanding driving conditions. The cooler’s inlet and outlet both feature 41.275 mm male threaded connections, allowing for secure and leak-resistant installation. With a compact profile measuring 10.9 inches in width, 5.6 inches in height, and 1.98 inches in depth, this cooler fits well within the engine bay without compromising space.

Common Applications and Problem Resolution

• Prevents transmission fluid overheating under heavy load or towing conditions
• Reduces risk of transmission failure due to excessive heat
• Replaces worn or damaged transmission coolers in Chevrolet Silverado and GMC Sierra HD trucks
• Helps maintain consistent transmission fluid temperature for improved shifting performance
• Addresses leaks or corrosion issues in original transmission coolers

Installation Notes and Tips

Installation of the Dorman 918-278 cooler requires basic mechanical skills and appropriate tools. Note that installation hardware is not included, so ensure you have compatible fittings and mounting components. The cooler comes with a mounting bracket for secure attachment. Verify that the male threaded inlet and outlet connections match your vehicle’s transmission lines. Properly tighten all fittings to avoid leaks and check for clearance around the cooler to prevent damage during operation.

Quality Assurance and Warranty

This Dorman automatic transmission oil cooler is manufactured to meet standard replacement quality requirements. Constructed from durable aluminum with a protective black finish, it offers corrosion resistance and long service life. While specific warranty details may vary, Dorman products typically include limited warranties covering defects in materials and workmanship. Refer to the product packaging or manufacturer documentation for exact warranty terms.