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Need to know what years will fit my '85, and would a ZR1 spring work as well?
 

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Need to know what years will fit my '85, and would a ZR1 spring work as well?
All C4 rear springs are the same fitment.
Rates got softer as years progressed
In most years the ZR1 rear spring is the same rate as the base spring or softer ( same rate as base '85 spring )
If you have a Z51 car then you have the stiffest rear spring fitted to any year ( except super stiff '84 )
 
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