It is something called a pickel fork - it drives the ball joint apart -
you will destroy the rubber boot - so replace that.  You should buy a
shop manual cause there are specific torque settings for a lot of the
components.  Pay particular attention to tightening the big bolt
holding the wheel on - it also holds the wheel bearing together - get a
helm manual - about $50.

think this is the one needing the slide hammer.  best check the workshop
manual - buy or library.

It's much safer to use a screw-type ball joint puller, and Harbor
Freight and J.C. Whitney sell inexpensive ones in several sizes and
styles that resemble this
www.thetoolwarehouse.net/shop/media/OTC-7315A.jpg or this
www.thetoolwarehouse.net/shop/media/OTC-7314A.jpg.  Be sure to get the
right size, and avoid any made of sheet metal bent into shape rather
than of forged metal.  Don't simply tighten the puller but pause every
turn to to give the metal time to move, and, if there's enough room,
hammer both sides of the arm simultaneously to help the ball joint
shaft move.  If you rush the job, the puller's tip can flatten from
exessive pressure.