One Stop Solutions 434 Radiator

OE-Style Radiator for GM Trucks

This One Stop Solutions radiator is built for 1988-1993 Chevrolet C1500, C2500, K1500, and K2500 applications, as well as 1988-1993 GMC C1500, C2500, K1500, and K2500 models. Part number 434 is engineered around OES form and function for a direct replacement on crossflow cooling systems.

• Premium-grade aluminum construction with plastic tanks
• Crossflow design with one-row core layout
• Transmission oil cooler included; engine oil cooler not included
• Cadmium-plated tubes inside and out to resist premature failure
• Die-cut gasket design for leak control
• Individually pressure tested during production
• Drop-in fit, form, and function for easier service

Built Around Factory Dimensions

OSC Premium New Automotive Radiator part number 434 is designed to match OE-style cooling performance while addressing common failure points found in higher-mileage trucks. Core dimensions measure 20 3/4 inches high by 17 1/4 inches wide with a 1-1/4 inch core thickness, and the unit uses a crossflow layout with 1 5/16 inch inlet and 1 9/16 inch outlet connections. The transmission cooler is plated and spaced 11 1/2 inches between fittings, making this radiator a practical replacement for Chevrolet C1500 and GMC K2500 cooling service where the original unit used a transmission cooler but no engine oil cooler.

This part cross-references Spectra Premium CU434 and APDI 8010434 for the same application.

Common Problems This Radiator Addresses

• Coolant leaks from aging tanks, seams, or gasket surfaces
• Reduced cooling efficiency from worn cores or restricted flow
• Transmission heat buildup in trucks with an integrated cooler
• Premature radiator failure caused by corrosion or internal wear
• Fitment issues from non-OE-style replacement parts

Installation Notes

Verify the vehicle uses the same crossflow configuration and transmission cooler layout before installation. Part 434 is built for hassle-free installation and includes the necessary fittings or hardware specified by the manufacturer. Confirm inlet and outlet sizes, header dimensions, and cooler spacing against the original radiator to ensure proper alignment in Chevrolet C1500, C2500, K1500, K2500 and GMC C1500, C2500, K1500, K2500 trucks.

Quality Assurance

Each radiator is pressure tested during production, with the transmission and engine oil coolers tested before tank installation, the core tested before assembly, and the completed unit tested again. OSC also uses engineering updates such as added fin density and thicker cores to improve durability and cooling performance in demanding truck applications.

Fitment

• Fits 1988-1993 Chevrolet C1500, N/A, wo/EOC
• Fits 1988-1993 Chevrolet C2500, N/A, wo/EOC
• Fits 1988-1993 Chevrolet K1500, N/A, wo/EOC
• Fits 1988-1993 Chevrolet K2500, N/A, wo/EOC
• Fits 1988-1993 GMC C1500, N/A, wo/EOC
• Fits 1988-1993 GMC C2500, N/A, wo/EOC
• Fits 1988-1993 GMC K1500, N/A, wo/EOC
• Fits 1988-1993 GMC K2500, N/A, wo/EOC