HOT1904 / 1904 - Application Notes Lower your GM F-Body 1" Below stock ride height to give it the right look, with an aggressive stance and a lower center of gravity. Our springs provide a firm, but not harsh ride. Each gray powder coated spring is precision wound using the highest quality steel. Specs: 1" Lowered Front 285-525 lb/in, 1" Lowered Rear 100-140 lb/in LT1, V6.