Gday Mick,
I used aluminium, rigid and light (not that my rangie is on a diet) I have 50mm spring lift and 30mm body. I did the body due to my motor conversion. Most I guess do a body lift to get bigger rubber under the truck.
With polyurethane, there are various hardnesses around ranging from Shore A20 which is very soft to A90 hard, if you do go that route I would be looking at the harder end of the scale.
I'm curious , why would you choose polyurethane against steel in the first place?


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