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Rear spring rate on the wagon is slightly lower than that of the sedan. But because of the difference in suspension design, the effective rate (measured at the wheel) is higher on the wagon. Therefore, putting stock sedan rear springs in the wagon will result in a slightly stiffer ride.
Based on info in the green shop manual, looks like there is indeed a big difference in diameter, with the sedan spring being 1/2 inch smaller. No unladen height specs, but they are nearly identical heights (within .07 inch) at identical loading.
Bottom line... I would think you would probably be okay using sedan springs if you use sedan seats, but I would definitely want to talk to someone that has been down this road, to confirm there are no other pitfalls.
Gary L
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1971 142E ITB racer, 1973 1800ES, 2002 S60 T5
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