actually that kit will work on the MJ, its only AAD not full packs. ive actually just ordered the RE 3.5 superflex for mine that im picking up saturday. personally i think the 4.5 will look too big for the 31's
RE always underrates their lifts as it is, your 4.5" lift will more likely sit @ 5-5.5"
ill let you know how mine goes and then ill throw up some pics when im done. ive seen some with the RE3.5 combo and it looks real nice.
'88 Comanche, '01 front clip, Mustang 5L, T-5 & Tonns of unnecessary noise
'91 Comanche, '01 front clip, I6 H.O, RE 3.5" Superflex
'91 CJ'd Sahara 4L