okay, there is no replacement ball joint on these models you must replace the whole control arm it is not much more to buy. At Napa you can buy a control arm for 80.00 dollars. This is much easy to do than pressing a ball joint and you get new bushings as well.
$700-$1200
The 1998 Nissan Ultima control arm is held in place by a retaining nut on both ends of the arm. The ball joint can be removed by using a hammer or mallet.
you need a pickle fork. use a this and a hammer to wedge the ball joint away from the control arm.
As far as I know nobody makes bushings for front control arms of Altima 93-01. Many Internet stores sells complete control arms with bushings and bell joint. I've found one that sells at 79$.
The control arm has to be replaced . for a 1995 sentra it costs 172$ at the dealer and on the web it available for 100$ each .
The rear universal joint on a 1998 Nissan Pathfinder should be replaced when it becomes worn out or broken. Symptoms of a worn joint include rough handling and suspension issues.
the ball joint needs replaced
You have to replace the lower control did assembly .
Control arm and ball joint are all one unit.
You must replace the entire control arm assembly with the ball joint included.
For the lower ball joint, remove the lower control arm and the ball joint seal. Press the ball joint from the control arm. Press the new ball joint into the lower control arm ensuring it is fully seated, install a new seal and the lower control arm.
I believe you can change just the ball joint on the lower control arms , the upper ball joints come with a new control arm