I'm not sure why there was no effect on the alignment. Maybe on of the site Guru's could comment on that. I theorized that lowering the spring bottom mount, while allowing a lower stance did not alter any of the steering geometry?

But I've been wrong before. Anyway I'm sure happy with the setup and unlike heating or cutting springs I can remove the blocks and bolt everything back together if I want. Chuck in NH[/quote]
Hi Chuck,
I am not quite Guru Status but the reason nothing changed when you dropped the spring pockets is that you didn't change the length of the suspension arms or their mounting position. You should see a slight camber change as the arms are now further "up" in relation to the chassis at normal ride height.
I have never seen it in the '57 manual but the '56 manual has a table of the part #'s and specs for 8 springs which seem to be what was used in '56 (see page 359). This includes the height at normal load which for all springs was set at 9.59", there are 3 wire dia's used and slightly different free heights ranging from 14.09 to 15.95. Also different but not identified is the number of coils. This is table is a good point of departure to specify new springs from a spring vendor. To lower the car one specifies a lower free height, to get about 1" of drop you need something like .75" reduction in normal load height.
I assume the T bird spring rate was the lowest at 290 lb/" of deflection. Back when this stuff was much more available I took two springs from a '56 2 door 6 cyl which had probably one of the springs that had a rate of 360 Lb/". I shortened those springs by a calculated amount to reduce the ride height about 1 1/2" which also has the effect of raising the spring rate to something like 420 lb/". They are in my Bird right now. The ride is fine but I do believe the rate could be somewhat higher, maybe 500 lb/" which would reduce body lean in hard cornering. Today there is the spring vendor Eaton that will custom make springs and I would get a set from them rather than try to find the old stuff and modify it.
Doug T
The Highlands, Louisville, Ky.
