its done all the time, it does not hurt any thing it will just have a bit more axle wrap. you cant use blocks to lower it, its spring over axle. a shorter shackle is a good idea too. i would not lift it more, that will raise the center of gravity, excess lift is something that can hurt you on the trail. as 4 crawler said, those springs will settle in quite a bit. its a good idea to run wegigt and do some offroad trail riding to get them to settle. they usually settle about 1-2 inches depending on your shackle length and angle. too short of a shackle and you might need to redo the spring perches to set your pinion angle, that or 4 crawler can make you a shim.