SYEs are not needed on MJs until you hit maybe 8". and even then it's due to needing the strength upgrade rather than an angularity issue. We have a much longer wheelbase than XJs and TJs and so our driveshaft angles are much less severe. :thumbsup:
We have 2 members here that have had Rustys leaf fail on them. Hellcreek would be a better option.
rough riding lifts are typically due to cheap shocks and/or stiff coils. be sure to do your research and you should be able to avoid both. It's usually less of a "this lift sucks" and more of a philosophical difference with how a lift should be (plus an added variable in that cheap lifts will typically have cheap shocks because, well, otherwise the lift wouldn't be cheap anymore). Lift companies with a history of parts failures or horrible customer service should generally be avoided.
don't forget the laundry list of parts that go with those 4.5" coils. :cheers: