This upgraded throttle pedal spring optimizes the original pedal sensitivity; it effectively reduces overly sensitive throttle response and improves abnormal forward jitter of vehicles in low gears, ideal for vehicles with ZF6 manual transmission Compatible with 2001-2005 6.6L LB7-LLY Duramax 2500/3500 trucks, matches mainstream models of the series and meets daily use modification needs Adopts fine production process with stable structural performance; the sturdy structure ensures long-term service life, not easy to deform in daily use Comes with standard size of 2.28 inch in length and 0.76 inch in outer diameter; accurate size ensures precise fitting with the vehicle installation position Designed for direct replacement of factory springs; no complicated modification steps required, plug-and-play installation saves time and effort