Rear Springs
I have been avidly following this discussion and while I don't claim to fully understand the calculations, two points come to mind.
1. 400lb/in seems a lot considering weight of car.
2. Robin, shouldn't the last part of your calculation about trailing arm lever effect be other way round : 12.5/16.5. If you do this, the result is approx 145lb/in, much closer to the 160lb/in figure obtained from " other website".
This is just a thought and I am more than willing to be corrected.
Alfie
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