When the car was in the 'MUT8SHN' config, a 71 LeMans, I ran lowered springs, think they were 575lbs rate.
When I went to the endura nose, I had to up it to like 650lbs, and a slightly taller spring. Mostly to prevent bottoming the suspension out.
Keep in mind I have free-articulating suspension, all del-alum, so requires a higher rate than factory type control arm bushings. Also have solid body bushings.
And no, before anyone asks, it rode fine, and not like a 'truck' like so many comments. Setup properly, it rides better than stock. Shocked all who rode in it, because it crushed the internet parroting narrative.
EDIT: To be more specific, I use Global West spring exclusively.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
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