Rear in with help of new U-bolts and shackle from Marysville truck (good people - fast and quality parts)
Leaves didn't seat right first time in perches. Figured out perches were filled with a stone like corrosion. Evedentially the leaf pins go further into perches on 2wd than 4. Took a bit with a chisel to clean them out.
Side note - locked dually axles are a pain to manuever into place by yourself! But I guess that means I now have a 4x6 instead of a 1x4 :D