If you go bigger than 2", you need longer shocks to match, then you have to worry about front/rear trackbar relocators, t-case drop/motor mount lift (MML), a SYE, which requires a new rear driveshaft, control arms, sway bar links, extended brake lines, and list gets longer as you go taller.
with 1.5" spacers, I think all you would need is longer shocks, I'm not sure if you can get away with stock shocks. With a 2" BB, you would want taller shocks.
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