The 4x2/4x4 designation was C/K, respectively, through 1986. It was changed to R/V for the 1987 model year for these vehicles, though they may still be commonly referred to as C/K by owners.
Attributes:
| CORE DIM (H x W): 18 7/8 X 28 1/4 |
| OVERALL (H x W): 21 1/8 X 33 3/4 |
| HOSE LOCATIONS: IN: DRIVER - OUT: PASSENGER |
| HOSE FITTINGS: IN: 1 3/8 - OUT: 1 5/8 |
| TRANS COOLER: 1/2-20 STRAIGHT THREAD, INVERTED FLARE |
| MOUNTING TYPE: SADDLE |
| FLOW DIRECTION: CROSS FLOW |
| CORE ROWS: 3 ROW |
| CORE THICKNESS: 2 1/4 |
| TANK WIDTH: 3 1/8 |
Applications:
| Name | Engine | Notes |
|---|---|---|
| 1973 - 1987 Chevrolet Blazer | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1973 - 1987 Chevrolet C Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1973 - 1987 Chevrolet K Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1987 Chevrolet R Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1987 Chevrolet V Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1973 - 1986 GMC C Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1973 - 1987 GMC Jimmy | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1973 - 1986 GMC K Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1987 GMC R Series | 5.7L 350ci V8, 7.4L 454ci V8 | |
| 1987 GMC V Series | 5.7L 350ci V8, 7.4L 454ci V8 |