Swift Coil-Over Helper Spring - 2.5" ID x 5.0" Tall - 50 lb. Turnlock Fastener Insert Plate and EFI systems that use

and EFI systems that use feedback control to auto tune

Accepts metric and big brake caliper

1995-2011 Mercury Grand Marquis

adaptable to virtually any size using SUSA ProLine Adapter Fittings

Swift Coil-Over Helper Spring - 2.5" ID x 5.0" Tall - 50 lb. Turnlock Fastener Insert Plate and EFI systems that useUnlike our assist springs, our helper springs are specifically designed to have a minimal effect on the spring rate of the main coilover spring. Helper springs allow the spring to stay on mounted on the coilover perch when the shock is under negative or zero load, also known as droop travel. It is ideal to run helper springs on setups where you cannot preload the main spring due to height issues or when experiencing springs coming loose from the