Performance Radiator for GMC C/K Trucks (1988-2000) 4.3L 5.0L 5.7L 6.5L 7.4L

Direct-Fit Performance All-Aluminum Radiator for 1988-2000 GMC C/K Trucks

What it Does: The Performance Radiator replaces failure-prone factory plastic-tank units on 1988-2000 GMC C/K Trucks to maximize thermal heat dissipation and prevent coolant loss under sustained towing and hauling loads.

The Stock GMC C/K Trucks Cooling Inefficiencies and Plastic Fatigue

Factory radiators on the GMT400 platform rely on crimped, injection-molded plastic end tanks mated to an aluminum core via elastomeric gaskets. Decades of heat cycling cause the OEM plastic to embrittle, leading to cracked tank necks, stress fractures near inlet and outlet ports, and compromised crimp seams under standard operating pressures. Furthermore, high-displacement workhorse platforms such as the Vortec 5700 (L31), Vortec 7400 (L29), and 6.5L Detroit Diesel overwhelm stock tube densities under heavy towing, resulting in heat soak, elevated transmission fluid temperatures, and unmanageable thermal spikes.

The Engineering Solution

This upgraded performance unit features an all-aluminum assembly with furnace-brazed tubes and hand-welded TIG aluminum end tanks, permanently eliminating the failure point of crimped plastic seals. The heavy-duty tube-and-fin core architecture increases convective surface area, dramatically accelerating heat transfer and reducing thermal recovery times. Engineered as a direct drop-in replacement, it utilizes factory mounting geometry and incorporates precision internal transmission oil cooler ports to ensure straightforward plumbing and structural reliability under maximum load.

Technical Specifications

Compatibility

• 1988-2000 GMC C1500 (4.3L V6, 5.0L V8, 5.7L V8, 6.5L Diesel)
• 1988-2000 GMC K1500 (4.3L V6, 5.0L V8, 5.7L V8, 6.5L Diesel)
• 1988-2000 GMC C2500 (5.0L V8, 5.7L V8, 6.5L Diesel, 7.4L V8)
• 1988-2000 GMC K2500 (5.0L V8, 5.7L V8, 6.5L Diesel, 7.4L V8)
• 1988-2000 GMC C3500 (5.7L V8, 6.5L Diesel, 7.4L V8)
• 1988-2000 GMC K3500 (5.7L V8, 6.5L Diesel, 7.4L V8)

Frequently Asked Questions

Does this fit the GMT400 C/K Trucks?
Yes, this is a direct fit for the 1988-2000 GMC C/K Trucks equipped with the GMT400 chassis and matching 1520 core footprint.

Does this radiator include the internal automatic transmission cooler?
Yes, it features integrated brass cooler ports designed to connect directly with factory transmission cooling lines.

The GMC Heavy-Duty Standard

Engineered to handle severe duty cycles, high-payload trailering, and prolonged steep grade climbs without the thermal instability or fluid leaks inherent to aged factory systems.