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Cold Case Radiators 77-87 GM Truck Auto Trans 21 Inch LS Swap Aluminum Radiator GMT556A21LS

Cold Case Radiators 77-87 GM Truck Auto Trans 21 Inch LS Swap Aluminum Radiator GMT556A21LS
Cold Case Radiators 77-87 GM Truck Auto Trans 21 Inch LS Swap Aluminum Radiator GMT556A21LS
$690.99 ea

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NEWARRIVING SOONEstimated Ship Date 06/24/2025 (If Ordered Today)
Model: 3934043
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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1977-1987 Chevy/GMC Truck 21 Inch LS Swap Aluminum Performance Radiator. This is the radiator that is 21 Inch high overall and has the steam port for an LS Swap. External trans cooler recommended.

These COLD-CASE radiators are Tig welded 100 percent aluminum and absolutely beautiful. Don't buy a 3 or 4 row aluminum radiator! It doesn't cool as good as these oversize 2 row models. These radiators are original appearing and have the correct stamping. Once painted, you'd be hard pressed to find a difference over an original versus a COLD-CASE.

  • 100 percent TIG welded
  • All Aluminum
  • 2 Rows of 1.25 Inch tubes
  • Polished OE style tanks
  • 16 fins per inch
  • Corrugated fins that give more surface area and more thermal transfer
  • Pressure tested
  • For automatic trans
  • Direct fitment for 77-87 GM Truck LS Swap trucks

Radiator Specs

  • Core Height 18.8 Inch
  • Core Width 28.35 Inch
  • Overall Height 21 Inch
  • Overall Width 34.33 Inch
  • Overall Thickness 3 Inch
  • Tubes (2) 1.25 Inch Tubes
  • Upper Hose 1.50 Inch
  • Lower Hose 1.50 Inch
About Cold Case Radiators

Cold-Case Radiators® is a division of Max Performance Inc, a leading supplier of auto restoration parts and accessories. Cold-Case Radiators® was founded in 2014 when a need for high quality aluminum radiators at a fair price surfaced. We're not new to the automotive business though. Max Performance Inc has been supplying the classic car market for over 35 years and Pypes Exhaust is our sister company, who has specialized in performance exhaust since 2003.

Our goal is simple. At Cold-Case Radiators®, we want to make aluminum performance radiators and accessories available and affordable to everyone. Even with our reduced prices, we do not sacrifice quality. All of our radiators are 100% tig welded aluminum. There is no cutting corners here.

We specialize in the Muscle Car market. From the 1950s all the way to present day, you will find Cold-Case Radiators® on American built muscle. The next time you want to upgrade that engine bay, remember the name...Cold-Case Radiators®.

Best thing about us is...Our radiators all come with a limited lifetime warranty! We stand behind our quality, research, and our products. If our radiator doesn't keep your car cool, send it back as part of our '60 day COOL Guarantee.'

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Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Fitment Notes
Chevrolet C10 Big Ten 1978 - 1980 LS Swap
Chevrolet C10 Cheyenne 1977 - 1981 LS Swap
Chevrolet C10 Custom Deluxe 1977 - 1980 LS Swap
Chevrolet C10 Custom 1981 - 1986 LS Swap
Chevrolet C10 Deluxe 1981 LS Swap
Chevrolet C10 Scottsdale 1977 - 1986 LS Swap
Chevrolet C10 Silverado 1977 - 1986 LS Swap
Chevrolet K10 Cheyenne 1977 - 1981 LS Swap
Chevrolet K10 Custom Deluxe 1977 - 1980 LS Swap
Chevrolet K10 Custom 1981 - 1986 LS Swap
Chevrolet K10 Deluxe 1981 LS Swap
Chevrolet K10 Scottsdale 1977 - 1986 LS Swap
Chevrolet K10 Silverado 1977 - 1986 LS Swap
Chevrolet K5 Blazer Cheyenne 1977 - 1980 LS Swap
Chevrolet K5 Blazer Custom Deluxe 1977 - 1980 LS Swap
Chevrolet K5 Blazer Custom 1981 - 1986 LS Swap
Chevrolet K5 Blazer Deluxe 1981 LS Swap
Chevrolet K5 Blazer Scottsdale 1984 LS Swap
Chevrolet K5 Blazer Silverado 1978 - 1986 LS Swap
GMC C1500 Heavy Half 1979 - 1980 LS Swap
GMC C1500 High Sierra 1979 - 1986 LS Swap
GMC C1500 Sierra Classic 1979 - 1986 LS Swap
GMC C1500 Sierra Grande 1979 - 1982 LS Swap
GMC C1500 Street Coupe 1979 - 1982 LS Swap
GMC C1500 1979 - 1986 LS Swap
GMC Jimmy High Sierra 1977 - 1985 LS Swap
GMC Jimmy Sierra Classic 1977 - 1987 LS Swap
GMC Jimmy Sierra Grande 1977 - 1982 LS Swap
GMC Jimmy Street Coupe 1978 - 1982 LS Swap
GMC Jimmy 1977 - 1987 LS Swap
GMC K1500 High Sierra 1979 - 1986 LS Swap
GMC K1500 Sierra Classic 1979 - 1986 LS Swap
GMC K1500 Sierra Grande 1979 - 1982 LS Swap
GMC K1500 1979 - 1986 LS Swap

Specifications:

CA Proposition 65 CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Color Silver
Core Height 18.8 Inch
Core Width 28.35 Inch
Engine LS Swap
Finish Polished
Fins Per Inch 16
Lower Hose 1.50 Inch
Manufacturer Warranty Limited Lifetime Warranty
Material Aluminum
Overall Height 21 Inch
Overall Width 34.33 Inch
Shroud Included No
Thickness 3.0 Inch
Transmission Type Manual
Upper Hose 1.50 Inch
Vehicle Type Truck/SUV

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Cold Case Radiators 77-87 GM Truck Auto Trans 21 Inch LS Swap Aluminum Radiator GMT556A21LS: