front suspension help

Our GT front coil is a 480lb spring and work great on the early Falcons and early Mustangs. The 560lb spring is too stiff for a 65-66 street car IMO. I do think more than 2deg. of positive caster is better but on a manual steer car, it can make parking a pain. I advise 2deg+. positive for the manual steer cars and 3deg+. positive for the power steer cars. Factory settings call for up to 1deg. Set a car to factory settings and it won't drive well no matter what parts are on the car. I also think a 15" steering wheel is a must. The 13 and 14 inch steering wheels don't give enough leverage and take away the feel of the car IMO.

I also think moving the upper ball joint backward is a better way to go than pulling the lower arm forward to get more caster. Pulling the lower arm forward changes the location of the outer tie rod end and messes up the steering geometry. It also brings the tire closer to the fender. We offset upper arms often to get more caster.

Here is a photo of one roller set I did for a pro drag racing team that wanted 8deg. of caster. I offset the upper arm 1/4". You can offset the shaft kit in the stock arms since they are right hand threads on both sides. You end up with a right and left side upper arm. We have done that to our cars and it works great.




Heck, we run up to 5deg. pos. on the track. The more the better for high speed stability. Though, when you get over 5deg. pos. the cars do start to feel weird.

FYI, the 620 stands for .620" , the size of the coil. They test at 560lbs so we call it like we see it.