What is the best way to check my ball joints before i replace them? how can i tell if i need to replace the top, the bottom, or both?

Jack that tire up and shake/move the top of the tire (maybe have someone watch it move also) and then do the same for the bottom. When they need to be replaced its kind of obvious when you do it this way.

Brian

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01 Edge Ext Cab
4.0 4x4 White

Mods:
Custom Winch Bumper, 9000lb winch, Custom Skid Plate, Custom Rock Sliders, Off-Road Lights, Explorer: OHC, Auto Dim Mirror, Lighted Vanity Visors, Power Seat Rails and EATC. Other little things I will remember to add later.

You can also check the bushing on them if there cracked open there bad if not they still got some life in them

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99 Ford Ranger 3.0 V6