Hello & Welcome to JA,
Here is info to help you. Notice the special puller. If you do not have this & gear puller wont do it . Use a carbide cutting /grinder to cut the pitman arm. Be carefull not to damage the pitman shaft.
Pitman Arm Replacement (4WD)
Notice: Do not hammer on the pitman arm, pitman arm shaft or puller. Damage to the pitman arm or steering gear may result.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
TightenTighten the pitman arm nut to 250 N·m (185 lb ft).
Can't free it from the center link.