ball joint problems

i purchased a 1996 mitsubishi galant a few months back and it has been hell ever since. bottom line is that i parked it and got another vechicle and am trying to prepare to give this one to someone else. before i do there is one last problem that i need to get fixed that being the ball joint. i was told it was the ball joint any way. it makes a loud popping almost a cracking sound when the car is either turning or going forward mostly on acceleration from non-moving to moving on the passenger side. if this does sound like the ball joint to you can you tell me if it is the upper or lower or both. since i bought the car in apr 2005 i have replaced the motor mounts and transmission mount, timing belt and water pump, left tie rod. thanks