Guys I have a 3.5" RE super ride lift on my 99cherokee. This past Tuesday I found what I consider to be a steal on 1.5" coil springs (pucks) and longer rear shackles with 4 shocks. My question is if I add this 1.5" to my existing lift that should be 5" of total lift. I already have a SYE. What else will I have to change? Also is it worth it because I'm scared of the dreaded drive line vibes and right now my jeep has no known issues!!!!