On my 2000 Explorer when I go over a speed bump or coming into a parking lot that has a good size bump the front end will make a groaning noise. I know nothing about suspensions and was hoping that someone could tell me whether this is worth getting checked out. About 3 years ago during the annual inspection the mechanic told me that the lower ball joints needed to be replaced. I declined at the time but am wondering if this could be related. She has over 115K and has never had anything done other than very routine engine, trans, differential maintenance performed.