'98 Ford Expedition lower ball joints?

Hello again. Yes you can replace the lower ball joints. There can be problems if you aren't skilled at removing this type of joint, since using a hammer or pressingthem with the wrong kind of adapter can bend the control arm. The factory control arms will give up their joints but you really need to exercise some caution. Don't try to just knock or press them out all at once, use some heat and just work at it. The aftermarket joints must be checked before you install them to ensure that they will fit and that they have the appropriate style of keeper for the control arm (that is the lock ring needs to be on the top of the joint which should press in from the bottom). Good luck - nice truck

if you have aftermarket control arms they can be replace if they are factory a arms no they can not be replaced. its just fords way of screwing you again at about 80,000 miles if you got more miles than that consider your self lucky.