So many items it could be. lets start by narrowing down a few things. Does it do it in 2wd , 4hi and awd mode? does it start around a certain mph? with windows down driving in quiet area can you pinpoint which corner the sound is coming from. sometimes helps to have friend on side of road listening while you drive by slowlyif it does it at low speed acceleration. just a few thoughts to get the idea ball rolling. also is it an intermittent squeak or a squeal? i dont know.about other people but there is.a big difference in my head. all depends on ones interpretation. Thinking suspension/arm noise if its a squeeak/rattle. air ride or coilovers? could be bushings just wearing out. but theres alot of smart people on here and im sure they will chime in. ( me not being one of them on the expy items)