The 40100 by Lakewood is a 90/10 front shock used on GM A and G body vehicles. These are designed to provide maxim front to rear weight transfer and have been proven to reduce ETs. Lakewood Industries is the leader in drag race chassis and suspension technology. Using decades of track and laboratory research, Lakewood Industries has developed the most consistent and accurate drag shock on the market today Lakewood drag shocks have been precisely tuned for superior weight transfer that remains consistent pass after pass. Additionally, the multi-stage valving provides more stability and control mid track. 90/10 front shocks and struts are intended for track use only and provide the maximum front to rear weight transfer. Disconnecting the front sway bar is recommended for maximum track performance.