I did a 2/4 drop on my 90 with springs and hangers, I found the parts through airbagit .com (formally known as truckin suspension) Front end 2” drop Air bag it no longer offer drop springs, but I cut “one” complete coil from a set of new (stock) coil springs. Rear end 4” drop I used 2” drop hangers #han-do7893
and 2” drop shackles #sha-do7893
for a 4” total drop, stock shocks are working well on both front and rear. I slow down for speed bumps but the 2/4 drop handles them fine.