Kinda long, but here's what worked, and didn't work for me:
RE 1345 coils (5.5"XJ/4.5"ZJ)
bought these in 1999, wheeled them for 5-6 solid years, in 2 different MJ's.
MIGHT have sagged 3/8" over max original ht (hard to say, since vehicles & weights have changed alot).
Spring rate (for me)...