Will i need to lengthen my driveshafts if i put a 4 inch lift kit on my bronco?

im about to lift my bronco 4 inches with the suspension and 2 inches with the body, i need to know what all ill have to do to my suspension for the 4 inch lift kit, will i need sway bar drop brackets and to lengthen my driveshafts or anything? also someone told me to use hockey pucks for my body lift, what would happen if i did this, would they flatten? its a 1990 ford bronco full size