Well you could get some new 2-3" lift springs but you will need to get alinement cams to readjust the camber..at the least, you "may" need to get a Superlift super runner steering system. Some have used F450 OBS springs
Best thing to do is install a D60 and SD springs but$$$ it will ride as good as a SD when its done.
When you install a D60 you need to get the F350 springs as the F250 ones are very stiff to control the D50.
Yes SD springs are longer ..4"+- but can be installed useing a RS kit. Its the only way to get a leaf spring front end OBS to ride good. The Rear SD springs can also be swaped into the rear ..bolts are differn't size but a 1 hour job total.
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