you need G30 front springs and G30 rear springs with gas shocks, hard to find new now....new is best, other wise get second hand G30 springs from a yank braker and get them re tempered like new, ... Dave.
If you want a sensible bit of lift you could swap the suspension pieces from a G30 as the heavy duty van sits a fair bit higher and the springs are firmer so though it sits higher it does not roll or wallow on the road.
It also looks more impressive on the bigger 8 lug wheels and tall aspect tyres.
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