HOT19105 / 19105 - Application Notes When we decided to manufacture coil spring for the 300C SRT8 we took our time and researched other springs on the market. With those springs in mind we found a great combination of performance and comfortable ride characteristics. Our springs feature a linear rate design, and come complete with urethane bump stops. Note: Not for vehicles with load leveling suspension Spring Rate: Front: 280lb Rear: 650 lb 300C SRT8 Drop:Front: 1/8" Rear: 5/8" Charger SRT8 Drop : Front: 1/4" Rear: 3/4"