My car is a mostly street driven 65 Mustang fastback with a stroked 351W (about 475FWHP), G-Force (T5) 5spd. and drag radials. I was running a 4.33:1 ratio but will be changing to a 3.89:1 ratio when my new N-case and 31 spline axles are ready in a few weeks.
I am planning to replace the very tired (2.5"
rear leaf springs, and am trying to decide what spring and spring rate to use. The car sits about an inch lower than stock, and has the Shelby A-arm mods, big sway bar etc. I realize this is far from ideal for straight-line traction, however I am looking for a balance between traction and a car with decent road manners. When I take it to the strip I will run a real slick, and hope to run somewhere in the 11's
From what I have read the Flexi-Form springs and Cal-Tracs make a great combination for drag racing. Is anyone using this combination on the street? Are they okay? Will they last?
Perhaps these are over-kill??? and stockish steel leafs would be fine??? I would like to hear your opinions, and recomendations for spring rate.
I am planning to replace the very tired (2.5"

From what I have read the Flexi-Form springs and Cal-Tracs make a great combination for drag racing. Is anyone using this combination on the street? Are they okay? Will they last?
Perhaps these are over-kill??? and stockish steel leafs would be fine??? I would like to hear your opinions, and recomendations for spring rate.