I installed these springs on a GMC Sonoma 96 4.3 5 speed. They are VERY HARD! This is the part number my J/M/M needs. Maybe they're for the 4-door Blazer. I am not sure. I would NOT recommend these for any V6 or 4 cylinder. pick up! Maybe good for v8 exchange. I believe they are the 750 pound spring rate. I chose the Moog 5660 600lb spring.
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