u won't have to replacen any ball or u joints. the only thing that you have to do isput longer shocks in the front end because stock front shock will lose a inch of up travel and 2 inches of down travel. i have a 3 inch leveling kit on my truck and installed it myelf over 40,000 miles ago.
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2003 2500 diablo tuner and powerpuck, stage 2 ddp 90 injectors,3 inch leveling kit, 35x12.50x20 toyo mud terrains, 4 in exhaust, glaicer electric lift pump, pryro/egt/ tranny auto meter gauges, afe stage 2 intake