A shackle adds half of its height to the lift, a 2" shackle will add 1" of lift because it is lifting only on end of the leaf spring.
With many lift shackles, it is necessary to trim a bumper mounting bracket bolt that the shackles run into, under full compression.
A lift shackle will also change the axle to drive shaft orientation and may need to have angled axle shims installed or changed to eliminate drive shaft vibrations.
2001 Sport, 4" lift, 33 X 10.50 KOs, R.E. DB, R.E.-UCA, JKS-LCA, ACOS, 8.25-4.56-TruTrac, SYE, D-30 E-locker w/alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Lots of armor, Towing baseplate.
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