TJM SPRING COIL SERIES 2000 (PR) F SERIES 80..
XGS Progressive Coil Springs
Progressive rate coils provide smooth comfortable ride when the vehicle is unladen and improved stability and load carrying ability when the vehicle is loaded. Designed to increase the spring rate as the load increases, the vehicle displays less tendency to bottom out, thus improving ride comfort. It's an ideal solution for vehicles that carry weight only occasionally.