The Cold Case GMT556A21 is a direct-fit 21 inch aluminum performance radiator for the 1977-1987 Chevy and GMC C and K series pickup with an automatic transmission and a 1.5 inch lower hose. It uses a 2-row core with two 1.25 inch tubes and 16 corrugated fins per inch, built with 100 percent TIG-welded all-aluminum construction and polished OE-style tanks, and includes a transmission cooler with a 5/16 inch inverted flare fitting. It also suits the matching full-size GM SUVs of the era, such as the Blazer, Jimmy, and Suburban.
- Type: aluminum performance radiator (automatic, 21 in, 1.5 in lower hose)
- Core: 2-row, two 1.25 in tubes, 16 corrugated fins per inch
- Construction: 100 percent TIG-welded aluminum, polished OE-style tanks
- Overall size: 34.33 in W x 21 in H x 3 in D (core 28.35 x 18.8 in)
- Hoses: 1.25 in upper, 1.5 in lower
- Transmission cooler: 5/16 in inverted flare fitting
- Part number: GMT556A21
Vehicle Applications
Direct fit on the following (automatic):
- 1977 Chevrolet C/K Pickup
- 1978 Chevrolet C/K Pickup
- 1979 Chevrolet C/K Pickup
- 1980 Chevrolet C/K Pickup
- 1981 Chevrolet C/K Pickup
- 1982 Chevrolet C/K Pickup
- 1983 Chevrolet C/K Pickup
- 1984 Chevrolet C/K Pickup
- 1985 Chevrolet C/K Pickup
- 1986 Chevrolet C/K Pickup
- 1987 Chevrolet C/K Pickup
- 1977 GMC C/K Pickup
- 1978 GMC C/K Pickup
- 1979 GMC C/K Pickup
- 1980 GMC C/K Pickup
- 1981 GMC C/K Pickup
- 1982 GMC C/K Pickup
- 1983 GMC C/K Pickup
- 1984 GMC C/K Pickup
- 1985 GMC C/K Pickup
- 1986 GMC C/K Pickup
- 1987 GMC C/K Pickup
FAQ
What vehicles does the Cold Case GMT556A21 fit?
The 1977-1987 Chevy and GMC C and K series pickup, plus the matching full-size Blazer, Jimmy, and Suburban.
Which lower hose size is this version?
This is the 1.5 inch lower hose version. Cold Case also offers a 1.75 inch lower hose version.
Is it built for automatic or manual?
This is the automatic-transmission version and includes a transmission cooler.
How many rows is the core?
A 2-row core with two 1.25 inch tubes and 16 corrugated fins per inch.
