Quick Facts

• Allows for easy adjustment of ride height and corner weights. (1 turn is equal to 1/8 of an inch change in ride height)
• Allows for lighter weight K-member, control arms and other front end components to be used reducing both unsprung weight and overall vehicle mass.
• Decreases motion ratio (how much the spring moves in relation to tire movement)
• More predictable spring action.
• Griggs coil over hardware components are made in USA form the finest aircraft quality aluminum, and sleeve is hard anodized for durability. 
• A Torrington thrustbearing at the top provides friction free steering in spite of spring load applied to the camber plate.

Coil-overs perform two primary functions: Reducing the unsprung weight (the coil-over springs are lighter do to there more outboard location) and it allows for the infinite adjustment to ride height. 

Secondary benefits are decreasing the suspensions motion ratio, the expression of how much the spring moves in relation to how much the tire moves.  By relocating the spring outboard to the strut in the front, or to the shock in the rear, and employing high quality materials, lighter weight and lower rate springs and spring seats and load supports can be used with increased roll control. This results in a far better performance package.

For more information about how this fits into a complete system please review the following:
"Been There, Done It All" October 2004, 5.0 Mustang and Super Fords (12.4 MB pdf )
The GR40 Suspension System
"Extreme Winner" May 2005, 5.0 Mustang and Super Fords (2.47 MB pdf)