Hey guys, why worry about modifying the std 40 series leaves?
Guys that I have spoken to in Australia flip the rear spring shackle hanger, moving the location of the rear shackle further rearwards - right to the end of the chassis rail basically. Just grind out bolts/rivets then flip and bolt back in with a few welds on top. Guys have used spring packs from either FJ55, 60 or 75 series trucks. You could then modify them to suit you application for height and spring rate. The amount of rearward shift then depends on spring used and the location of the locating pin from the front hangar - re drill as you please...
Hope this helps - my first post on IH8MUD!
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guys here do that too, but some can't weld, some don't access to springs from 60s, 55 springs are harder to find, 70 series were never brought to the us, so you won't find those springs here. some just don't want to mess with it. modifying 40 springs is easy compared to moving mounts.