Not to dis the IRS or anything, Cause I would love to have one too!!!
But Griggs says that his Torque Arm & PanHard Bar Set-up can out perform an IRS!!!
If so I would think that the Griggs route would be cheaper!!! They use a soft springs in the rear on his set-up should give you a good ride on those sh!tty streets in CA. I think that Griggs suggests any where between 200-250 lb spring rate for the rear!!! Thats pretty soft!!!
P.S. taht is Coil Over in the rear too, forgot to mention that!!!
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94 GT, Canary yellow
AODE
BBK specific rate springs
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