1981-89 Square Body Chevy & GMC Truck, Blazer, Suburban Transmission Cooler Lines 4WD Diesel Engine

Replace your leaking, rusted, or damaged transmission cooler lines with these 1981-89 Square Body Chevy & GMC Truck, Blazer, Suburban Transmission Cooler Lines 4WD Diesel Engine. Designed specifically for 4-wheel drive models equipped with a diesel engine and automatic transmission, these cooler lines are precision bent to match the original factory routing for an easy, direct fit installation.

Transmission cooler lines play a vital role in carrying transmission fluid between the transmission and radiator, helping maintain proper operating temperatures and extending the life of your automatic transmission. Over time, the original lines can rust, corrode, or develop leaks, leading to fluid loss, poor transmission performance, and potentially costly repairs.

Available in your choice of OE style steel or stainless steel, these 5/16-inch cooler lines provide the correct fit and dependable performance. OE steel lines are ideal for factory correct restorations, while stainless steel offers superior corrosion resistance for long term durability in harsh driving conditions.

Each line is manufactured to original GM specifications with the correct bends and contours, ensuring proper clearance around the engine, suspension, and frame components.

Key Features

• Fits 1981–1989 Chevy & GMC Square Body trucks, Blazers, and Suburbans
• Designed for 4WD diesel models with automatic transmissions
• Correct 5/16-inch transmission cooler lines
• Precision bent to match original GM routing
• Available in OE style steel or stainless steel
• Direct replacement for factory cooler lines
• Helps maintain proper transmission fluid temperatures
• Reduces the risk of leaks caused by rusted or damaged lines
• Manufactured for an accurate fit and easy installation
• Ideal for restoration or routine maintenance

Whether you're restoring a classic Square Body or replacing worn transmission lines as preventative maintenance, these factory style cooler lines provide the quality, fit, and reliability needed to keep your transmission operating at its best. We have quality 1977-87 Square Body Chevy & GMC Truck Aluminum Radiator you might want to look into replacing.